SIST EN ISO 14713-1:2017

Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 1: General principles of design and corrosion resistance (ISO 14713-1:2017)

This document provides guidelines and recommendations regarding the general principles of
design which are appropriate for articles to be zinc coated for corrosion protection and the level of
corrosion resistance provided by zinc coatings applied to iron or steel articles, exposed to a variety of
environments. Initial protection is covered in relation to
— available standard processes,
— design considerations, and
— environments for use.
This document applies to zinc coatings applied by the following processes:
a) hot dip galvanized coatings (applied after fabrication);
b) hot dip galvanized coatings (applied onto continuous sheet);
c) sherardized coatings;
d) thermal sprayed coatings;
e) mechanically plated coatings;
f) electrodeposited coatings.
These guidelines and recommendations do not deal with the maintenance of corrosion protection
in service for steel with zinc coatings. Guidance on this subject can be found in ISO 12944-5 and
ISO 12944-8.
NOTE There are a variety of product-related standards (e.g. for nails, fasteners, ductile iron pipes, etc.)
which provide specific requirements for the applied zinc coating systems which go beyond any general guidance
presented in this document. These specific product-related requirements will take precedence over these general
recommendations.

Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und Stahlkonstruktionen vor Korrosion - Teil 1: Allgemeine Konstruktionsgrundsätze und Korrosionsbeständigkeit (ISO 14713-1:2017)

Revêtements de zinc - Lignes directrices et recommandations pour la protection contre la corrosion du fer et de l'acier dans les constructions - Partie 1: Principes généraux de conception et résistance à la corrosion (ISO/FDIS 14713-1:2016)

ISO 14713-1:2017 fournit des lignes directrices et des recommandations concernant les principes généraux de conception appropriés pour les pièces revêtues de zinc pour la protection contre la corrosion et le niveau de résistance à la corrosion assuré par les revêtements de zinc appliqués aux pièces en fer ou en acier, exposées à de nombreux environnements. La protection initiale est traitée en relation avec
-      les procédés normalisés existants,
-      les considérations théoriques, et
-      les environnements d'utilisation.
ISO 14713-1:2017 s'applique aux revêtements de zinc appliqués au moyen des procédés suivants:
a)    revêtements obtenus par galvanisation à chaud (appliqués après fabrication);
b)    revêtements obtenus par galvanisation à chaud (appliqués sur tôle en continu);
c)    revêtements obtenus par shérardisation;
d)    revêtements obtenus par projection thermique;
e)    revêtements obtenus par voie mécanique (matoplastie);
f)     revêtements obtenus par galvanoplastie.
Ces lignes directrices et recommandations ne traitent pas de l'entretien de la protection contre la corrosion en service pour l'acier revêtu de zinc. Des lignes directrices correspondantes sont fournies dans l'ISO 12944‑5 et dans l'ISO 12944‑8.

Cinkove prevleke - Smernice in priporočila za zaščito železnih in jeklenih konstrukcij proti koroziji - 1. del: Splošna načela za projektiranje in korozijsko odpornost (ISO 14713-1:2017)

Ta dokument določa smernice in priporočila glede splošnih načel za projektiranje, ki so primerna za izdelke s cinkovimi prevlekami za zaščito proti koroziji in stopnjo
odpornosti na korozijo, ki jo zagotavljajo cinkove prevleke, nanesene na železne ali jeklene izdelke, ki so izpostavljeni različnim okoljskim dejavnikom. Prvotna zaščita je zajeta v povezavi z:
– razpoložljivimi standardnimi postopki;
– napotki za projektiranje in
– okolji za uporabo.
Ta dokument se uporablja za cinkove prevleke, nanesene z naslednjimi postopki:
a) vroče galvanizirane prevleke (nanesene po izdelavi);
b) vroče galvanizirane prevleke (nanesene na neprekinjeno ploščo);
c) šerardirane prevleke;
d) prevleke, nanesene z vročim brizganjem;
e) mehansko obdelane prevleke;
f) elektrogalvanske prevleke.
Te smernice in priporočila ne obravnavajo vzdrževanja protikorozijske zaščite
jekel s cinkovimi prevlekami. Smernice o tem je mogoče najti v standardih ISO 12944-5 in
ISO 12944-8.
OPOMBA: Obstajajo različni standardi, ki se nanašajo na izdelke (npr. za žeblje, pritrdilne elemente, cevi iz duktilne litine itd.) in podajajo posebne zahteve za nanesene sisteme cinkovih prevlek, ki presegajo vse splošne smernice, predstavljene v tem dokumentu. Te zahteve, povezane s specifičnimi izdelki, imajo prednost pred temi splošnimi priporočili.

General Information

• Status: Published
• Public Enquiry End Date: 02-Mar-2017
• Publication Date: 10-Aug-2017
• ICS: 25.220.40 - Metallic coatings
• ICS: 91.080.10 - Metal structures
• ICS: 91.080.13 - Steel structures
• Technical Committee: IPKZ - Protection of metals against corrosion
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 02-Aug-2017
• Due Date: 07-Oct-2017
• Completion Date: 11-Aug-2017
• Ref Project: EN ISO 14713-1:2017 - Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 1: General principles of design and corrosion resistance (ISO 14713-1:2017)

Relations

• Replaces: SIST EN ISO 14713-1:2010 - Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 1: General principles of design and corrosion resistance (ISO 14713-1:2009)
• Effective Date: 01-Sep-2017
• Replaces: SIST EN ISO 14713-1:2010 - Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 1: General principles of design and corrosion resistance (ISO 14713-1:2009)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 14713-1:2017
01-september-2017
1DGRPHãþD
SIST EN ISO 14713-1:2010
&LQNRYHSUHYOHNH6PHUQLFHLQSULSRURþLOD]D]DãþLWRåHOH]QLKLQMHNOHQLK
NRQVWUXNFLMSURWLNRUR]LMLGHO6SORãQDQDþHOD]DSURMHNWLUDQMHLQNRUR]LMVNR
RGSRUQRVW,62
Zinc coatings - Guidelines and recommendations for the protection against corrosion of
iron and steel in structures - Part 1: General principles of design and corrosion resistance
(ISO 14713-1:2017)
Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und
Stahlkonstruktionen vor Korrosion - Teil 1: Allgemeine Konstruktionsgrundsätze und
Korrosionsbeständigkeit (ISO 14713-1:2017)
Revêtements de zinc - Lignes directrices et recommandations pour la protection contre
la corrosion du fer et de l'acier dans les constructions - Partie 1: Principes généraux de
conception et résistance à la corrosion (ISO/FDIS 14713-1:2016)
Ta slovenski standard je istoveten z: EN ISO 14713-1:2017
ICS:
25.220.40 Kovinske prevleke Metallic coatings
91.080.10 Kovinske konstrukcije Metal structures
91.080.13 Jeklene konstrukcije Steel structures
SIST EN ISO 14713-1:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 14713-1:2017

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SIST EN ISO 14713-1:2017


EN ISO 14713-1
EUROPEAN STANDARD

NORME EUROPÉENNE

May 2017
EUROPÄISCHE NORM
ICS 25.220.40 Supersedes EN ISO 14713-1:2009
English Version

Zinc coatings - Guidelines and recommendations for the
protection against corrosion of iron and steel in structures
- Part 1: General principles of design and corrosion
resistance (ISO 14713-1:2017)
Revêtements de zinc - Lignes directrices et Zinküberzüge - Leitfäden und Empfehlungen zum
recommandations pour la protection contre la Schutz von Eisen- und Stahlkonstruktionen vor
corrosion du fer et de l'acier dans les constructions - Korrosion - Teil 1: Allgemeine
Partie 1: Principes généraux de conception et Konstruktionsgrundsätze und Korrosionsbeständigkeit
résistance à la corrosion (ISO 14713-1:2017) (ISO 14713-1:2017)
This European Standard was approved by CEN on 3 May 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14713-1:2017 E
worldwide for CEN national Members.

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SIST EN ISO 14713-1:2017
EN ISO 14713-1:2017 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 14713-1:2017
EN ISO 14713-1:2017 (E)
European foreword
This document (EN ISO 14713-1:2017) has been prepared by Technical Committee ISO/TC 107
“Metallic and other inorganic coatings” in collaboration with Technical Committee CEN/TC 262
“Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of
metals and alloys” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2017, and conflicting national standards
shall be withdrawn at the latest by November 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 14713-1:2009.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 14713-1:2017 has been approved by CEN as EN ISO 14713-1:2017 without any
modification.


3

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SIST EN ISO 14713-1:2017

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SIST EN ISO 14713-1:2017
INTERNATIONAL ISO
STANDARD 14713-1
Second edition
2017-04
Zinc coatings — Guidelines and
recommendations for the protection
against corrosion of iron and steel in
structures —
Part 1:
General principles of design and
corrosion resistance
Revêtements de zinc — Lignes directrices et recommandations
pour la protection contre la corrosion du fer et de l’acier dans les
constructions —
Partie 1: Principes généraux de conception et résistance à la corrosion
Reference number
ISO 14713-1:2017(E)
©
ISO 2017

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Materials . 2
4.1 Iron and steel substrates . 2
4.2 Zinc coatings . 3
5 Selection of zinc coating. 3
6 Design requirements . 3
6.1 General principles of design to avoid corrosion . 3
6.2 Design for application of different zinc coating processes . 4
6.3 Tubes and hollow sections. 4
6.3.1 General. 4
6.3.2 Corrosion protection of internal and external surfaces . 4
6.4 Connections . 5
6.4.1 Fastenings to be used with hot dip galvanized, sherardized or thermally
sprayed coatings. 5
6.4.2 Welding considerations related to coatings . 5
6.4.3 Brazing or soldering . 6
6.5 Duplex systems . 6
6.6 Maintenance . 6
7 Corrosion in different environments . 6
7.1 Atmospheric exposure . 6
7.2 Exposure to soils . 9
7.3 Exposure to water .12
7.4 Abrasion .12
7.5 Exposure to chemicals .12
7.6 Elevated temperatures .13
7.7 Contact with concrete .13
7.8 Contact with wood .14
7.9 Bimetallic contact .14
8 Accelerated test methods applied to zinc coatings .16
Bibliography .17
© ISO 2017 – All rights reserved iii

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 4, Hot dip coatings (galvanized, etc.).
This second edition cancels and replaces the first edition (ISO 14713-1:2009), of which it constitutes
a minor revision following the publication of ISO 17668:2016 and ISO 9223:2012, with the following
changes:
— ISO 17668 has replaced EN 13811;
— revisions to Table 1 to align with corresponding descriptions of typical environments in
ISO 9223:2012, Table C.1 and to make clearer that the corrosion rates presented are for the first
year of exposure.
A list of all parts in the ISO 14713 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

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SIST EN ISO 14713-1:2017
INTERNATIONAL STANDARD ISO 14713-1:2017(E)
Zinc coatings — Guidelines and recommendations for
the protection against corrosion of iron and steel in
structures —
Part 1:
General principles of design and corrosion resistance
1 Scope
This document provides guidelines and recommendations regarding the general principles of
design which are appropriate for articles to be zinc coated for corrosion protection and the level of
corrosion resistance provided by zinc coatings applied to iron or steel articles, exposed to a variety of
environments. Initial protection is covered in relation to
— available standard processes,
— design considerations, and
— environments for use.
This document applies to zinc coatings applied by the following processes:
a) hot dip galvanized coatings (applied after fabrication);
b) hot dip galvanized coatings (applied onto continuous sheet);
c) sherardized coatings;
d) thermal sprayed coatings;
e) mechanically plated coatings;
f) electrodeposited coatings.
These guidelines and recommendations do not deal with the maintenance of corrosion protection
in service for steel with zinc coatings. Guidance on this subject can be found in ISO 12944-5 and
ISO 12944-8.
NOTE There are a variety of product-related standards (e.g. for nails, fasteners, ductile iron pipes, etc.)
which provide specific requirements for the applied zinc coating systems which go beyond any general guidance
presented in this document. These specific product-related requirements will take precedence over these general
recommendations.
2 Normative references
ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods
ISO 2063, Thermal spraying — Metallic and other inorganic coatings — Zinc, aluminium and their alloys
ISO 2064, Metallic and other inorganic coatings — Definitions and conventions concerning the measurement
of thickness
ISO 8044:2015, Corrosion of metals and alloys — Basic terms and definitions
ISO 12683, Mechanically deposited coatings of zinc — Specification and test methods
© ISO 2017 – All rights reserved 1

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

ISO 17668, Zinc diffusion coatings on ferrous products — Sherardizing — Specification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1461, ISO 2063, ISO 2064,
ISO 8044, ISO 12683 and ISO 17668 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
atmospheric corrosion
corrosion with the earth’s atmosphere at ambient temperature as the corrosive environment
[SOURCE: ISO 8044:2015, 3.4]
3.2
elevated temperatures
temperatures between +60 °C and +200 °C
3.3
exceptional exposure
special cases such as exposure that substantially intensifies the corrosive exposure and/or places
increased demands on the corrosion protection system
3.4
life to first maintenance
time interval that can elapse after initial coating before coating deterioration reaches the point when
maintenance is necessary to restore protection of the basis metal
4 Materials
4.1 Iron and steel substrates
In hot dip galvanizing, the reactivity of the steel is modified by its chemical composition, particularly
by the silicon plus phosphorus contents (see ISO 14713-2). The metallurgical and chemical nature of the
steel is irrelevant to protection by thermally sprayed or sherardized coatings.
The broad range of steels likely to be subject to zinc coating will commonly fall into the following
categories:
— carbon steel, composed simply of iron and carbon, accounts for 90 % of steel production [e.g.
EN 10025-2 and EN 10080 (steel reinforcement)];
— high-strength, low-alloy (HSLA) steels have small additions (usually <2 % by weight) of other
elements, typically 1,5 % manganese, to provide additional strength for a modest price increase
(e.g. EN 10025-6);
— low-alloy steel is alloyed with other elements, usually molybdenum, manganese, chromium, or nickel,
in amounts of up to 10 % by weight to improve the hardenability of thick sections (e.g. EN 10083-1).
Steel can be hot rolled or cold formed. Hot rolling is used to produce angle, “I”, “H” and other structural
sections. Some structural sections, e.g. safety barriers, cladding rails and cladding panels, are cold formed.
Cast and wrought irons are of various metallurgical and chemical compositions. This is irrelevant to
protection by thermally sprayed or sherardized coatings but special consideration is needed regarding
the cast irons most suitable for hot dip galvanizing (see ISO 14713-2).
2 © ISO 2017 – All rights reserved

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

4.2 Zinc coatings
The application of zinc coatings provides an effective method of retarding or preventing corrosion of
ferrous materials (see Clause 1 for the range of zinc coatings/processes covered by this document).
Zinc coatings are used in this regard because they protect iron and steel both by barrier action and by
galvanic action.
5 Selection of zinc coating
The zinc coating system to be used should be selected by taking the following items into account:
a) the general environment (macro-climate) in which it is to be applied;
b) local variations in the environment (micro-climate), including anticipated future changes and any
exceptional exposure;
c) the required life to first maintenance of the zinc coating system;
d) the need for ancillary components;
e) the need for post-treatment for temporary protection;
f) the need for painting, either initially (duplex system) or when the zinc coating is approaching the
end of its life to first maintenance to achieve minimal maintenance cost;
g) the availability and cost;
h) if the life to first maintenance of the system is less than that required for the structure, its ease of
maintenance.
NOTE The life for a zinc coating in any particular atmospheric exposure condition is approximately
proportional to the thickness of the coating.
The operational sequence for applying the selected system should be determined in consultation with
the steel fabricator and the applier of the zinc coating system.
6 Design requirements
6.1 General principles of design to avoid corrosion
Design of structures and products should influence the choice of protective system. It may be
appropriate and economic to modify the design to suit the preferred protective system.
The items in a) to j) should be considered.
a) Safe and easy access for cleaning and maintenance should be provided.
b) Pockets and recesses in which water and dirt can collect should be avoided; a design with smooth
contours facilitates application of a protective coating and helps to improve corrosion resistance.
Corrosive chemicals should be directed away from structural components, e.g. drainage tubes
should be used to control de-icing salts.
c) Areas which are inaccessible after erection should be given a coating system designed to last the
required life of the structure.
d) If bimetallic corrosion (corrosion due to contact between dissimilar materials: metals and/or
alloys) is possible, additional protective measures should be considered (see ISO 14713-2).
e) Where the coated iron and steel are likely to be in contact with other building materials, special
consideration should be given to the contact area; e.g. the use of paint, tapes or plastic foils should
be considered.
© ISO 2017 – All rights reserved 3

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

f) Hot dip galvanizing, sherardizing, mechanical coating, zinc flake coating or electroplating can be
provided only in works; thermal spraying can be applied in works or on site. When paint is to be
applied to a zinc coating, the application is more readily controlled in works but, where there is
a likelihood of substantial damage occurring during transportation and erection, specifiers may
prefer to apply the final paint coat on site. The application of a powder coating on metal-coated
steel can only be done in works.
Where the total system is applied offsite, the specification has to cover the need for care at all
stages to prevent damage to the finished iron and steel and set out repair procedures to the coating
once the steelwork is erected.
g) Hot dip galvanizing (in accordance with ISO 1461), sherardizing (in accordance with ISO 17668) or
thermal spraying (in accordance with ISO 2063) should take place after bending and other forms of
fabrication.
h) Methods of marking parts should not have an influence on the quality of the pre-treatment
operations prior to coating.
i) Precautions may be required to minimize the likelihood of deformation during processing or
subsequently.
j) The conditions experienced by the articles during coating application may also need to be
considered.
6.2 Design for application of different zinc coating processes
The design practice for hot dip coating differs from that for other zinc coating systems. ISO 14713-2
provides guidance on the design for hot dip coatings. This supplements the general principles of good
design for steel structures.
The design practice for sherardized coatings can be found in ISO 14713-3.
The design for zinc thermal spraying should be discussed with the thermal sprayer at an early stage so
that adequate provision is made for access to all areas of the article (see EN 15520).
The design for electroplating with zinc follows the general design principles for electroplating and these
are not given here. The design for mechanical coating is best discussed with specialist applicators; in
general, these processes are most suitable for small parts which can be tumbled in a barrel but specialist
plants may be available for other shapes.
6.3 Tubes and hollow sections
6.3.1 General
If they are dry and hermetically sealed, the internal surfaces of tubes and hollow sections will not need
protection. Where hollow sections are fully exposed to the weather, or interior environments that
might give rise to condensation, and are not hermetically sealed, consideration should be given to the
need for both internal and external protection.
6.3.2 Corrosion protection of internal and external surfaces
Hot dip galvanizing gives equal thickness internally and externally. There are some special products
where the thickness of the coating is different on internal and external surfaces, e.g. tubes for water
distribution systems (see EN 10240). When tubes and hollow sections are hot dip galvanized after
assembly into structures, drainage/venting holes should be provided for processing purposes (see
ISO 14713-2).
Sherardizing gives equal thickness internally and externally. No precautions are needed for hollow
sections. When tubes are sherardized, the zinc dust and sand mixture should be loaded into the tubes
before starting the thermal diffusion process (see ISO 14713-3).
4 © ISO 2017 – All rights reserved

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SIST EN ISO 14713-1:2017
ISO 14713-1:2017(E)

6.4 Connections
6.4.1 Fastenings to be used with hot dip galvanized, sherardized or thermally sprayed coatings
The protective treatment of bolts, nuts and other parts of the structural connections should be given
careful consideration. Ideally, their protective treatment should provide a similar performance to
that specified for the general surfaces. Specific requirements are given in the appropriate product
International Standards (e.g. ISO 10684) and in a series of International Standards for coatings on
fasteners which are in the course of preparation/publication.
Hot dip galvanized (see, for example, ISO 1461 which covers specified minimum coating thicknesses
up to 55 µm), sherardized or other coatings on steel fasteners should be considered. Alternatively,
stainless steel fasteners can be used; for precautions, to take in order to minimize the potential for
bimetallic corrosion, see 7.9.
The mating surfaces of connections made with high-strength friction-grip bolts should be given special
treatment. It is not necessary to remove thermally sprayed, sherardized or hot dip coatings from
such areas to obtain an adequate coefficient of friction. However, consideration has to be given to any
long-term slip or creep-avoidance requirements and to any necessary adjustments to the assembly
dimensions.
6.4.2 Welding considerations related to coatings
It is recommended to weld prior to hot dip galvanizing, sherardizing or thermal spraying. The use of
welding anti-spatter sprays that cannot be removed in the pretreatment process at the galvanizers’
works should be avoided. For this reason, where welding sprays are used, low silicone, water-soluble
sprays are recommended. After welding, the surface should be prepared to the standard specified for
preparing the steelwork overall before applying the protective coating process. Welding should be
balanced (i.e. equal amounts on each side of the main axis) to avoid introducing unbalanced stresses
in a structure. Welding residues have to be removed before coating. The normal pretreatments for
thermal spraying are usually sufficient for this purpose but extra pretreatment may be needed for hot
dip galvanizing; in par
...

SLOVENSKI STANDARD
oSIST prEN ISO 14713-1:2017
01-februar-2017
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Zinc coatings - Guidelines and recommendations for the protection against corrosion of
iron and steel in structures - Part 1: General principles of design and corrosion resistance
(ISO/FDIS 14713-1:2016)
Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und
Stahlkonstruktionen vor Korrosion - Teil 1: Allgemeine Konstruktionsgrundsätze und
Korrosionsbeständigkeit (ISO/FDIS 14713-1:2016)
Revêtements de zinc - Lignes directrices et recommandations pour la protection contre
la corrosion du fer et de l'acier dans les constructions - Partie 1: Principes généraux de
conception et résistance à la corrosion (ISO/FDIS 14713-1:2016)
Ta slovenski standard je istoveten z: prEN ISO 14713-1
ICS:
25.220.40 Kovinske prevleke Metallic coatings
91.080.10 Kovinske konstrukcije Metal structures
91.080.13 Jeklene konstrukcije Steel structures
oSIST prEN ISO 14713-1:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 14713-1:2017

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oSIST prEN ISO 14713-1:2017
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 14713-1
ISO/TC 107/SC 4
Zinc coatings — Guidelines and
Secretariat: BSI
recommendations for the protection
Voting begins on:
2016-12-12 against corrosion of iron and steel in
structures —
Voting terminates on:
2017-03-06
Part 1:
General principles of design and
corrosion resistance
Revêtements de zinc — Lignes directrices et recommandations
pour la protection contre la corrosion du fer et de l’acier dans les
constructions —
Partie 1: Principes généraux de conception et résistance à la corrosion
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 14713-1:2016(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2016

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ISO/FDIS 14713-1:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials . 2
4.1 Iron and steel substrates . 2
4.2 Zinc coatings . 2
5 Selection of zinc coating. 3
6 Design requirements . 3
6.1 General principles of design to avoid corrosion . 3
6.2 Design for application of different zinc coating processes . 4
6.3 Tubes and hollow sections. 4
6.3.1 General. 4
6.3.2 Corrosion protection of internal and external surfaces . 4
6.4 Connections . 5
6.4.1 Fastenings to be used with hot dip galvanized, sherardized or thermally
sprayed coatings. 5
6.4.2 Welding considerations related to coatings . 5
6.4.3 Brazing or soldering . 6
6.5 Duplex systems . 6
6.6 Maintenance . 6
7 Corrosion in different environments . 6
7.1 Atmospheric exposure . 6
7.2 Exposure to soils . 9
7.3 Exposure to water .12
7.4 Abrasion .12
7.5 Exposure to chemicals .12
7.6 Elevated temperatures .13
7.7 Contact with concrete .13
7.8 Contact with wood .14
7.9 Bimetallic contact .14
8 Accelerated test methods applied to zinc coatings .16
Bibliography .17
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 4, Hot dip coatings (galvanized, etc.).
This second edition cancels and replaces the first edition (ISO 14713-1:2009), of which it constitutes
a minor revision following the publication of ISO 17668:2016 and ISO 9223:2012, with the following
changes:
— inclusion of ISO 17668 in normative references and replacement of various references to EN 13811
with reference to ISO 17668;
— revisions to Table 1 to align with corresponding descriptions of typical environments in
ISO 9223:2012, Table C.1 and to make clearer that the corrosion rates presented are for the first
year of exposure.
A list of all parts in the ISO 14713 series can be found on the ISO website.
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oSIST prEN ISO 14713-1:2017
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 14713-1:2016(E)
Zinc coatings — Guidelines and recommendations for
the protection against corrosion of iron and steel in
structures —
Part 1:
General principles of design and corrosion resistance
1 Scope
This document provides guidelines and recommendations regarding the general principles of
design which are appropriate for articles to be zinc coated for corrosion protection and the level of
corrosion resistance provided by zinc coatings applied to iron or steel articles, exposed to a variety of
environments. Initial protection is covered in relation to
— available standard processes,
— design considerations, and
— environments for use.
This document applies to zinc coatings applied by the following processes:
a) hot dip galvanized coatings (applied after fabrication);
b) hot dip galvanized coatings (applied onto continuous sheet);
c) sherardized coatings;
d) thermal sprayed coatings;
e) mechanically plated coatings;
f) electrodeposited coatings.
These guidelines and recommendations do not deal with the maintenance of corrosion protection
in service for steel with zinc coatings. Guidance on this subject can be found in ISO 12944-5 and
ISO 12944-8.
NOTE There are a variety of product-related standards (e.g. for nails, fasteners, ductile iron pipes, etc.)
which provide specific requirements for the applied zinc coating systems which go beyond any general guidance
presented in this document. These specific product-related requirements will take precedence over these general
recommendations.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1461, ISO 2063, ISO 2064,
ISO 8044, ISO 12683 and ISO 17668 and the following apply.
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ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
atmospheric corrosion
corrosion with the earth’s atmosphere at ambient temperature as the corrosive environment
[SOURCE: ISO 8044:2015, 3.4]
3.2
elevated temperatures
temperatures between +60 °C and +200 °C
3.3
exceptional exposure
special cases such as exposure that substantially intensifies the corrosive exposure and/or places
increased demands on the corrosion protection system
3.4
life to first maintenance
time interval that can elapse after initial coating before coating deterioration reaches the point when
maintenance is necessary to restore protection of the basis metal
4 Materials
4.1 Iron and steel substrates
In hot dip galvanizing, the reactivity of the steel is modified by its chemical composition, particularly
by the silicon plus phosphorus contents (see ISO 14713-2). The metallurgical and chemical nature of the
steel is irrelevant to protection by thermally sprayed or sherardized coatings.
The broad range of steels likely to be subject to zinc coating will commonly fall into the following
categories:
— carbon steel, composed simply of iron and carbon, accounts for 90 % of steel production [e.g.
EN 10025-2 and EN 10080 (steel reinforcement)];
— high-strength, low-alloy (HSLA) steels have small additions (usually <2 % by weight) of other
elements, typically 1,5 % manganese, to provide additional strength for a modest price increase
(e.g. EN 10025-6);
— low-alloy steel is alloyed with other elements, usually molybdenum, manganese, chromium, or nickel,
in amounts of up to 10 % by weight to improve the hardenability of thick sections (e.g. EN 10083-1).
Steel can be hot rolled or cold formed. Hot rolling is used to produce angle, “I”, “H” and other structural
sections. Some structural sections, e.g. safety barriers, cladding rails and cladding panels, are cold formed.
Cast and wrought irons are of various metallurgical and chemical compositions. This is irrelevant to
protection by thermally sprayed or sherardized coatings but special consideration is needed regarding
the cast irons most suitable for hot dip galvanizing (see ISO 14713-2).
4.2 Zinc coatings
The application of zinc coatings provides an effective method of retarding or preventing corrosion of
ferrous materials (see Clause 1 for the range of zinc coatings/processes covered by this document).
Zinc coatings are used in this regard because they protect iron and steel both by barrier action and by
galvanic action.
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5 Selection of zinc coating
The zinc coating system to be used should be selected by taking the following items into account:
a) the general environment (macro-climate) in which it is to be applied;
b) local variations in the environment (micro-climate), including anticipated future changes and any
exceptional exposure;
c) the required life to first maintenance of the zinc coating system;
d) the need for ancillary components;
e) the need for post-treatment for temporary protection;
f) the need for painting, either initially (duplex system) or when the zinc coating is approaching the
end of its life to first maintenance to achieve minimal maintenance cost;
g) the availability and cost;
h) if the life to first maintenance of the system is less than that required for the structure, its ease of
maintenance.
NOTE The life for a zinc coating in any particular atmospheric exposure condition is approximately
proportional to the thickness of the coating.
The operational sequence for applying the selected system should be determined in consultation with
the steel fabricator and the applier of the zinc coating system.
6 Design requirements
6.1 General principles of design to avoid corrosion
Design of structures and products should influence the choice of protective system. It may be
appropriate and economic to modify the design to suit the preferred protective system.
The items in a) to j) should be considered.
a) Safe and easy access for cleaning and maintenance should be provided.
b) Pockets and recesses in which water and dirt can collect should be avoided; a design with smooth
contours facilitates application of a protective coating and helps to improve corrosion resistance.
Corrosive chemicals should be directed away from structural components, e.g. drainage tubes
should be used to control de-icing salts.
c) Areas which are inaccessible after erection should be given a coating system designed to last the
required life of the structure.
d) If bimetallic corrosion (corrosion due to contact between dissimilar materials: metals and/or
alloys) is possible, additional protective measures should be considered (see ISO 14713-2).
e) Where the coated iron and steel are likely to be in contact with other building materials, special
consideration should be given to the contact area; e.g. the use of paint, tapes or plastic foils should
be considered.
f) Hot dip galvanizing, sherardizing, mechanical coating, zinc flake coating or electroplating can be
provided only in works; thermal spraying can be applied in works or on site. When paint is to be
applied to a zinc coating, the application is more readily controlled in works but, where there is
a likelihood of substantial damage occurring during transportation and erection, specifiers may
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prefer to apply the final paint coat on site. The application of a powder coating on metal-coated
steel can only be done in works.
Where the total system is applied offsite, the specification has to cover the need for care at all
stages to prevent damage to the finished iron and steel and set out repair procedures to the coating
once the steelwork is erected.
g) Hot dip galvanizing (in accordance with ISO 1461), sherardizing (in accordance with ISO 17668) or
thermal spraying (in accordance with ISO 2063) should take place after bending and other forms of
fabrication.
h) Methods of marking parts shall not have an influence on the quality of the pre-treatment operations
prior to coating.
i) Precautions may be required to minimize the likelihood of deformation during processing or
subsequently.
j) The conditions experienced by the articles during coating application may also need to be
considered.
6.2 Design for application of different zinc coating processes
The design practice for hot dip coating differs from that for other zinc coating systems. ISO 14713-2
provides guidance on the design for hot dip coatings. This supplements the general principles of good
design for steel structures.
The design practice for sherardized coatings can be found in ISO 14713-3.
The design for zinc thermal spraying should be discussed with the thermal sprayer at an early stage so
that adequate provision is made for access to all areas of the article (see EN 15520).
The design for electroplating with zinc follows the general design principles for electroplating and these
are not given here. The design for mechanical coating is best discussed with specialist applicators; in
general, these processes are most suitable for small parts which can be tumbled in a barrel but specialist
plants may be available for other shapes.
6.3 Tubes and hollow sections
6.3.1 General
If they are dry and hermetically sealed, the internal surfaces of tubes and hollow sections will not need
protection. Where hollow sections are fully exposed to the weather, or interior environments that
might give rise to condensation, and are not hermetically sealed, consideration should be given to the
need for both internal and external protection.
6.3.2 Corrosion protection of internal and external surfaces
Hot dip galvanizing gives equal thickness internally and externally. There are some special products
where the thickness of the coating is different on internal and external surfaces, e.g. tubes for water
distribution systems (see EN 10240). When tubes and hollow sections are hot dip galvanized after
assembly into structures, drainage/venting holes should be provided for processing purposes (see
ISO 14713-2).
Sherardizing gives equal thickness internally and externally. No precautions are needed for hollow
sections. When tubes are sherardized, the zinc dust and sand mixture should be loaded into the tubes
before starting the thermal diffusion process (see ISO 14713-3).
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6.4 Connections
6.4.1 Fastenings to be used with hot dip galvanized, sherardized or thermally sprayed coatings
The protective treatment of bolts, nuts and other parts of the structural connections should be given
careful consideration. Ideally, their protective treatment should provide a similar performance to
that specified for the general surfaces. Specific requirements are given in the appropriate product
International Standards (e.g. ISO 10684) and in a series of International Standards for coatings on
fasteners which are in the course of preparation/publication.
Hot dip galvanized (see, for example, ISO 1461 which covers specified minimum coating thicknesses
up to 55 µm), sherardized or other coatings on steel fasteners should be considered. Alternatively,
stainless steel fasteners can be used; for precautions, to take in order to minimize the potential for
bimetallic corrosion, see 7.9.
The mating surfaces of connections made with high-strength friction-grip bolts should be given special
treatment. It is not necessary to remove thermally sprayed, sherardized or hot dip coatings from
such areas to obtain an adequate coefficient of friction. However, consideration has to be given to any
long-term slip or creep-avoidance requirements and to any necessary adjustments to the assembly
dimensions.
6.4.2 Welding considerations related to coatings
It is recommended to weld prior to hot dip galvanizing, sherardizing or thermal spraying. The use of
welding anti-spatter sprays that cannot be removed in the pretreatment process at the galvanizers’
works should be avoided. For this reason, where welding sprays are used, low silicone, water-soluble
sprays are recommended. After welding, the surface should be prepared to the standard specified for
preparing the steelwork overall before applying the protective coating process. Welding should be
balanced (i.e. equal amounts on each side of the main axis) to avoid introducing unbalanced stresses
in a structure. Welding residues have to be removed before coating. The normal pretreatments for
thermal spraying are usually sufficient for this purpose but extra pretreatment may be needed for hot
dip galvanizing; in particular, weld slag should be removed separately. Some forms of welding leave
alkaline deposits behind. These have to be removed by blast-cleaning followed by washing with clean
water before applying thermally sprayed coatings. (This does not apply to hot dip galvanizing and
sherardizing where the pretreatment process removes alkaline deposits.)
It is desirable that fabrication takes place without the use of a blast primer, as this has to be removed
before hot dipping, sherardizing or thermal spraying.
Where welding takes place after hot dip galvanizing, sherardizing or thermal spraying, it is preferable,
before welding, to remove the coating locally in the area of the weld to ensure the highest-quality weld.
After welding, protection should be appropriately restored locally by thermal spraying, “solder sticks”
and/or zinc dust paints.
It is not recommended to weld sherardized articles, but spot-welding may be possible in certain
applications.
After welding of coated steels, the surface should be prepared to the standard specified for preparing
the steelwork overall before applying paint or fusion-bonded powder coatings.
Assemblies comprising different metals needing different pre-treatments should be discussed with the
processor.
Welding of zinc-coated parts must be done with appropriate local air ventilation in accordance with
health and safety regulations.
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6.4.3 Brazing or soldering
Soft-soldered assemblies cannot be hot dip galvanized or sherardized and brazing should be avoided if
possible — many types of brazing are unsuitable for hot dip galvanizing or sherardizing. The galvanizer
or sherardizer should be consulted if brazing is being considered.
Since corrosive fluxes may be used in these processes, removal of flux residues after the coating process
is essential to avoid corrosion of the coated parts; the design of these parts should facilitate this.
6.5 Duplex systems
ISO 12944-5 and EN 13438 give information on organic coatings which are applied to hot dip galvanized
or sherardized coatings. When such an organic coating has been applied, the term “duplex system” is
used to describe the combination of coatings — historically, this term was most commonly used to
describe organic coatings on hot dip galvanized articles.
NOTE EN 15773 deals with quality and communications requirements in the supply chain when specifying
the supply of duplex systems.
The life of a zinc-coated steel structure is longer than the life of the zinc coating system that is initially
applied to it, as some steel can be lost by corrosion before a structure becomes unserviceable. If it is
necessary to prolong the life of the zinc coating, maintenance has to take place before any steel rusting
occurs and preferably while at least 20 µm to 30 µm of zinc coating remains. This gives a maintained
zinc coating plus organic coating system a longer total life than a simple organic coating.
The total life of a zinc coating plus organic coating system is usually significantly greater than the
sum of the lives of the zinc coating and protective organic coating. There is a synergistic effect, i.e. the
presence of zinc coatings reduces under-rusting of the paint film; the paint preserves the zinc coating
from early corrosion. Where it is desired to retain a reasonably intact layer of paint as a basis for
maintenance, the initially applied paint system should have extra thickness.
Maintenance usually takes place when the zinc coating loses its appearance or becomes degraded.
Zinc coatings usually take longer to degrade than paint. Hence, a zinc coating may be recommended
for 20 years or more up to first maintenance, whereas the same coating when covered by paint is, for
reasons of appearance of the paint, recommended for only 10 years up to first maintenance. It should
also be noted that an area of degraded paint can retain moisture and hence hasten the corrosion of
metal, particularly on a surface not washed by rain.
If maintenance is delayed until the zinc coating has been consumed and rusting has started, the iron
and steel h
...