Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 5: Protective paint systems (ISO 12944-5:2019)

This document describes the types of paint and paint system commonly used for corrosion protection of steel structures.
It also gives guidelines for the selection of paint systems available for different environments (see ISO 12944‑2) except for corrosivity category CX and category Im4 as defined in ISO 12944‑2 and different surface preparation grades (see ISO 12944‑4), and the durability grade to be expected (see ISO 12944‑1).

Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme - Teil 5: Beschichtungssysteme (ISO 12944-5:2019)

Dieses Dokument beschreibt die für den Korrosionsschutz von Stahlbauten allgemein verwendeten Arten von Beschichtungsstoffen und Beschichtungssystemen.
Es gibt außerdem eine Anleitung für die Auswahl von Beschichtungssystemen, für verschiedene Umgebungs-bedingungen (siehe ISO 12944-2), mit Ausnahme der Korrosivitätskategorie CX und der Kategorie Im4 nach ISO 12944-2 und verschiedener Oberflächenvorbereitungsgrade (siehe ISO 12944-4), und die zu erwartende Schutzdauer (siehe ISO 12944-1).

Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture - Partie 5: Systèmes de peinture (ISO 12944-5:2019)

Le présent document décrit les types de peinture et de systèmes de peinture couramment utilisés pour la protection contre la corrosion des structures en acier.
Il fournit également des lignes directrices pour le choix de systèmes de peinture adaptés aux différents environnements (voir l'ISO 12944-2), excepté les catégories de corrosivité CX et la catégorie Im4 telles que définies dans l'ISO 12944-2, les différents degrés de préparation de surface (voir l'ISO 12944-4) et le niveau de durabilité attendu (voir l'ISO 12944-1).

Barve in laki - Protikorozijska zaščita jeklenih konstrukcij z zaščitnimi premaznimi sistemi - 5. del: Zaščitni premazni sistemi (ISO 12944-5:2019)

V tem dokumentu so opisane vrste barv in premaznih sistemov, ki so pogosto uporabljeni za protikorozijsko zaščito jeklenih konstrukcij. Podane so tudi smernice za izbiro premaznih sistemov, ki so na voljo za različna okolja (glej ISO 12944-2), razen za korozijsko kategorijo CX in kategorijo Im4, kot je določeno v standardu ISO 12944-2, in različne stopnje priprave površine (glej ISO 12944-4), ter določena je pričakovana stopnja trajnosti (glej ISO 12944-1).

General Information

Status
Published
Publication Date
22-Oct-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
23-Oct-2019
Completion Date
23-Oct-2019

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SLOVENSKI STANDARD
SIST EN ISO 12944-5:2020
01-januar-2020
Nadomešča:
SIST EN ISO 12944-5:2018

Barve in laki - Protikorozijska zaščita jeklenih konstrukcij z zaščitnimi premaznimi

sistemi - 5. del: Zaščitni premazni sistemi (ISO 12944-5:2019)

Paints and varnishes - Corrosion protection of steel structures by protective paint

systems - Part 5: Protective paint systems (ISO 12944-5:2019)

Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme -

Teil 5: Beschichtungssysteme (ISO 12944-5:2019)

Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture -

Partie 5: Systèmes de peinture (ISO 12944-5:2019)
Ta slovenski standard je istoveten z: EN ISO 12944-5:2019
ICS:
25.220.20 Površinska obdelava Surface treatment
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
91.080.13 Jeklene konstrukcije Steel structures
SIST EN ISO 12944-5:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12944-5:2020
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SIST EN ISO 12944-5:2020
EN ISO 12944-5
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 87.020 Supersedes EN ISO 12944-5:2018
English Version
Paints and varnishes - Corrosion protection of steel
structures by protective paint systems - Part 5: Protective
paint systems (ISO 12944-5:2019)

Peintures et vernis - Anticorrosion des structures en Beschichtungsstoffe - Korrosionsschutz von

acier par systèmes de peinture - Partie 5: Systèmes de Stahlbauten durch Beschichtungssysteme - Teil 5:

peinture (ISO 12944-5:2019) Beschichtungssysteme (ISO 12944-5:2019)
This European Standard was approved by CEN on 3 September 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12944-5:2019 E

worldwide for CEN national Members.
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SIST EN ISO 12944-5:2020
EN ISO 12944-5:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 12944-5:2020
EN ISO 12944-5:2019 (E)
European foreword

This document (EN ISO 12944-5:2019) has been prepared by Technical Committee ISO/TC 35 "Paints

and varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the

secretariat of which is held by DIN.

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 April 2020, and conflicting national standards shall be

withdrawn at the latest by April 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 12944-5:2018.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 12944-5:2019 has been approved by CEN as EN ISO 12944-5:2019 without any

modification.
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SIST EN ISO 12944-5:2020
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SIST EN ISO 12944-5:2020
INTERNATIONAL ISO
STANDARD 12944-5
Fourth edition
2019-09
Paints and varnishes — Corrosion
protection of steel structures by
protective paint systems —
Part 5:
Protective paint systems
Peintures et vernis — Anticorrosion des structures en acier par
systèmes de peinture —
Partie 5: Systèmes de peinture anticorrosion
Reference number
ISO 12944-5:2019(E)
ISO 2019
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Classification of environments .............................................................................................................................................................. 3

5 New work and refurbishment ................................................................................................................................................................. 3

5.1 New work and total refurbishment ....................................................................................................................................... 3

5.2 Partial refurbishment ........................................................................................................................................................................ 4

6 Types of paint .......................................................................................................................................................................................................... 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Examples of generic type of paints ........................................................................................................................................ 4

6.2.1 Alkyd paints (AK) ............................................................................................................................................................ 4

6.2.2 Acrylic paints (AY) .......................................................................................................................................................... 4

6.2.3 Ethyl silicate paints (ESI) .......................................................................................................................................... 5

6.2.4 Paints for epoxy coatings (EP) ............................................................................................................................. 5

6.2.5 Paints for polyurethane coatings (PUR) ...................................................................................................... 5

6.2.6 Paints for polyaspartic coatings (PAS) .......................................................................................................... 6

6.2.7 Paints for polysiloxane coatings (PS) ............................................................................................................. 6

7 Paint systems ............................................................................................................................................................................................................ 6

7.1 Priming coats and type of primers ........................................................................................................................................ 6

7.1.1 General...................................................................................................................................................................................... 6

7.1.2 Types of primer ................................................................................................................................................................. 6

7.2 Subsequent coats .................................................................................................................................................................................. 7

7.2.1 General...................................................................................................................................................................................... 7

7.2.2 Intermediate coats ......................................................................................................................................................... 7

7.2.3 Topcoats .................................................................................................................................................................................. 7

7.3 Dry film thickness................................................................................................................................................................................. 7

7.4 Durability ..................................................................................................................................................................................................... 7

7.5 Shop and site application ............................................................................................................................................................... 8

8 Tables for protective paint systems for C2 to C5, Im1, Im2 and Im3 ..............................................................9

8.1 Reading the tables ................................................................................................................................................................................ 9

8.2 Parameters influencing durability ......................................................................................................................................... 9

8.3 Designation of the paint systems listed ............................................................................................................................. 9

8.4 Guidelines for selecting the appropriate paint system ........................................................................................ 9

Annex A (normative) Abbreviated terms and descriptions.......................................................................................................10

Annex B (normative) Minimum requirements for corrosion protection systems .............................................11

Annex C (informative) Paint systems for carbon steel ....................................................................................................................15

Annex D (informative) Paint systems on hot dip galvanized steel ......................................................................................18

Annex E (informative) Paint systems on thermal-sprayed metallic coatings .........................................................20

Annex F (informative) Pre-fabrication primers .....................................................................................................................................21

Bibliography .............................................................................................................................................................................................................................23

© ISO 2019 – All rights reserved iii
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(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 of 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 www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee

SC 14, Protective paint systems for steel structures.

This fourth edition cancels and replaces the third edition (ISO 12944-5:2018), of which it constitutes a

minor revision.
The changes compared to the previous edition are as follows:

— correction of the former doubled category "G5.02" in Tables D.1 to read "G5.02a" and "G5.02b";

— correction of the table headlines of Tables B.3 and B.4;
— some editorial changes.
A list of all parts in the ISO 12944 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(E)
Introduction

Unprotected steel in the atmosphere, in water and in soil is subjected to corrosion that may lead to

damage. Therefore, to avoid corrosion damage, steel structures are normally protected to withstand

the corrosion stresses during the required service life required of the structure.

There are different ways of protecting steel structures from corrosion. ISO 12944 (all parts) deals with

protection by paint systems and covers, in the various parts, all features that are important in achieving

adequate corrosion protection. Additional or other measures are possible but require particular

agreement between the interested parties.

In order to ensure effective corrosion protection of steel structures, owners of such structures, planners,

consultants, companies carrying out corrosion protection work, inspectors of protective coatings

and manufacturers of coating materials need to have at their disposal state-of-the-art information in

concise form on corrosion protection by paint systems. It is vital that such information is as complete as

possible, unambiguous and easily understandable to avoid difficulties and misunderstandings between

the parties concerned with the practical implementation of protection work.

ISO 12944 (all parts) is intended to give this information in the form of a series of instructions.

It is written for those who have some technical knowledge. It is also assumed that the user of

ISO 12944 (all parts) is familiar with other relevant International Standards, in particular those dealing

with surface preparation.

Although ISO 12944 (all parts) does not deal with financial and contractual questions, attention is

drawn to the fact that, because of the considerable implications of inadequate corrosion protection,

non-compliance with requirements and recommendations given in ISO 12944 (all parts) can result in

serious financial consequences.

ISO 12944-1 defines the overall scope of ISO 12944. It gives some basic terms and definitions and a

general introduction to the other parts of ISO 12944. Furthermore, it includes a general statement on

health, safety and environmental protection, and guidelines for using ISO 12944 (all parts) for a given

project.

This document gives some terms and definitions related to paint systems in combination with guidance

for the selection of different types of protective paint system.
© ISO 2019 – All rights reserved v
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SIST EN ISO 12944-5:2020
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SIST EN ISO 12944-5:2020
INTERNATIONAL STANDARD ISO 12944-5:2019(E)
Paints and varnishes — Corrosion protection of steel
structures by protective paint systems —
Part 5:
Protective paint systems
1 Scope

This document describes the types of paint and paint system commonly used for corrosion protection

of steel structures.

It also gives guidelines for the selection of paint systems available for different environments (see

ISO 12944-2) except for corrosivity category CX and category Im4 as defined in ISO 12944-2 and

different surface preparation grades (see ISO 12944-4), and the durability grade to be expected (see

ISO 12944-1).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods

ISO 2063 (all parts), Thermal spraying — Zinc, aluminium and their alloys
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 3549, Zinc dust pigments for paints — Specifications and test methods

ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual

assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates

and of steel substrates after overall removal of previous coatings

ISO 8503-1, Preparation of steel substrates before application of paints and related products — Surface

roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO

surface profile comparators for the assessment of abrasive blast-cleaned surfaces

ISO 12944-1, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 1: General introduction

ISO 12944-2, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 2: Classification of environments

ISO 19840, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12944-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
© ISO 2019 – All rights reserved 1
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(E)
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
compatibility

ability of two or more products to be used together successfully

as a paint system without causing undesirable effects
3.2
priming coat
first coat of a paint system
3.3
intermediate coat
coat between the priming coat (3.2) and the topcoat (3.6)
3.4
tie coat
coat designed to improve intercoat adhesion
[SOURCE: ISO 4618:2014, 2.262]
3.5
sealer

coating material applied to porous surface prior to painting to reduce the absorptivity

Note 1 to entry: An example for a porous surface is a thermal sprayed metal layer.

3.6
topcoat
final coat of a coating system
3.7
primer

paint that has been formulated for use as a priming coat (3.2) on prepared surfaces

3.8
pre-fabrication primer

fast-drying paint that is applied to blast-cleaned steel to provide temporary protection during

fabrication while still allowing welding and cutting

[SOURCE: ISO 4618:2014, 2.204, modified — “primer” has been replaced by “paint”, and “protect it” has

been replaced by “provide temporary protection”.]
3.9
dry film thickness
DFT

thickness of a coating remaining on the surface when the coating has hardened/cured

3.10
nominal dry film thickness
NDFT
dry film thickness (3.9) specified for each coat or for the whole paint system
3.11
maximum dry film thickness

highest acceptable dry film thickness (3.9) above which the performance of the paint or the paint system

could be impaired
3.12
pot life

maximum time, at any particular temperature, during which a coating material supplied as separate

components can successfully be used after they have been mixed together
2 © ISO 2019 – All rights reserved
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(E)
3.13
shelf life

time during which a coating material will remain in good condition when stored in its original sealed

container under normal storage conditions

Note 1 to entry: The expression “normal storage conditions” is usually understood to mean storage between

+5 °C and +30 °C.
4 Classification of environments

The following five atmospheric corrosivity categories are relevant for this document:

— C1 very low;
— C2 low;
— C3 medium;
— C4 high;
— C5 very high.

The atmospheric environments defined in ISO 12944-2 are considered, except corrosivity category

CX. Systems for offshore-CX environments are described in ISO 12944-9. For other CX environments,

individual systems need to be defined according to the special needs of that environment.

The following three categories for water and soil are relevant for this document:

— Im1 immersion in fresh water;
— Im2 immersion in sea or brackish water;
— Im3 buried in soil.

The immersed environments defined in ISO 12944-2 are considered, except category Im4. Systems for

offshore, related structures and Im4 environments are described in ISO 12944-9.
5 New work and refurbishment
5.1 New work and total refurbishment

The surfaces to be coated encountered in new structures are carbon steel of rust grade A, B and C

as defined in ISO 8501-1, as well as hot dip galvanized steel and thermal-sprayed metallic coating

(see ISO 12944-1). Possible surface preparation is described in ISO 12944-4. The substrate and the

recommended surface preparation grade are given in Table B.1. The quality of the surface preparation

is essential for the durability of a coating system. The paint systems listed in Annex C, Annex D and

Annex E are typical examples of systems used in the environments listed in Clause 4 when applied

to steel surfaces with rust grades A to C, as defined in ISO 8501-1, or to hot dip galvanized steel or

thermal-sprayed metallic coating. Where the steel has deteriorated to the extent that pitting corrosion

has taken place (rust grade D as defined in ISO 8501-1), the dry film thickness or the number of coats

shall be increased to compensate for the increased surface roughness, and the paint manufacturer

should be consulted for recommendations.

In principle, no corrosion protection is required for corrosivity category C1. If, for aesthetic reasons,

painting is necessary, a system intended for corrosivity category C2 (with a low durability) may be chosen.

If unprotected steelwork destined for corrosivity category C1 is initially transported, stored

temporarily or assembled in an exposed situation (for example, a C4/C5 coastal environment), corrosion

will commence due to air-borne contaminants/salts and will continue even when the steelwork is

© ISO 2019 – All rights reserved 3
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SIST EN ISO 12944-5:2020
ISO 12944-5:2019(E)

moved to its final category C1 location. To avoid this problem, the steelwork should either be protected

during site storage or given a suitable primer coat. The dry film thickness should be appropriate for the

expected storage time and the severity of the storage environment.
5.2 Partial refurbishment

Systems for partial refurbishment should be specified and agreed separately for every object between

the interested parties. The paint systems listed in Annex C, Annex D and Annex E may be used, if they

are suitable. In special cases, other types of systems might be required for repair works.

The necessary surface preparation of any old coating and the compatibility of the coating system to be

applied should be tested in an appropriate manner before starting the repair works.

Test areas can be prepared to check the manufacturer's recommendations and/or compatibility with

the previous paint system.
6 Types of paint
6.1 General

Based on the corrosivity category, various examples of paint systems, which are informative in nature,

are given in Tables C.1 to C.6, Table D.1 and Table E.1 in relation to the expected durability. The systems

have been included because of their proven track record, but the list is not intended to be exhaustive and

other similar systems are also acceptable. Only the generic types of binders mentioned in the systems in

Tables C.1 to C.6, Table D.1 and Table E.1 are described in this clause. Pigments, fillers and additives are

important ingredients of a paint as well. Depending on the composition of the paint, the performance of

the coating can vary strongly within a given binder technology. The binder types described in Clause 6

are only examples, other generic types of coatings can be used as well.

In addition, new technologies are continually being developed, often driven by government legislation,

and these should always be considered where appropriate and where performance has been validated by

a) the track record of such technologies, and/or
b) the results of testing at least in accordance with ISO 12944-6.

NOTE Information given in 6.2 concerns only the chemical and physical properties of paints and coatings

and not the way they are used. Variations can be expected for each type of paint, depending on its formulation.

6.2 Examples of generic type of paints
6.2.1 Alkyd paints (AK)

In these single pack paints, the film hardens/forms by evaporation of solvent and/or water, and by

reaction of the binder with oxygen from the atmosphere.
6.2.2 Acrylic paints (AY)
Acrylic paints are single pack coating materials; water-borne and sol
...

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