SIST EN ISO 12944-4:2018
(Main)Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 4: Types of surface and surface preparation (ISO 12944-4:2017)
Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 4: Types of surface and surface preparation (ISO 12944-4:2017)
This document covers the following types of surfaces of steel structures consisting of carbon or lowalloy
steel, and their preparation:
— uncoated surfaces;
— surfaces thermally sprayed with zinc, aluminium or their alloys;
— hot-dip-galvanized surfaces;
— zinc-electroplated surfaces;
— sherardized surfaces;
— surfaces painted with prefabrication primer;
— other painted surfaces.
This document defines a number of surface preparation grades but does not specify any requirements
for the condition of the substrate prior to surface preparation.
Highly polished surfaces and work-hardened surfaces are not covered by this document.
Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme - Teil 4: Arten von Oberflächen und Oberflächenvorbereitung (ISO 12944-4:2017)
In diesem Dokument werden die folgenden Oberflächenarten von Stahlbauten aus unlegiertem oder niedriglegiertem Stahl und deren Vorbereitung behandelt:
— unbeschichtete Oberflächen;
— thermisch gespritzte Oberflächen mit Zink, Aluminium oder Legierungen daraus;
— feuerverzinkte Oberflächen;
— galvanisch verzinkte Oberflächen;
— sherardisierte Oberflächen;
— Oberflächen mit Fertigungsbeschichtungen;
— andere beschichtete Oberflächen.
In diesem Dokument werden eine Reihe von Oberflächenvorbereitungsgraden festgelegt, jedoch keine Anforderungen an den Zustand des Untergrunds vor der Oberflächenvorbereitung.
Hochpolierte und kaltverfestigte Oberflächen werden in diesem Dokument nicht behandelt.
Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture - Partie 4: Types de surface et de préparation de surface (ISO 12944-4:2017)
ISO 12944-4:2017 traite des types suivants de surfaces des structures en acier au carbone et faiblement allié et de leur préparation:
- surfaces non revêtues;
- surfaces revêtues par projection à chaud de zinc, d'aluminium ou de leurs alliages;
- surfaces galvanisées au trempé à chaud;
- surfaces électrozinguées;
- surfaces shérardisées;
- surfaces revêtues d'un primaire de préfabrication;
- autres surfaces peintes.
ISO 12944-4:2017 définit un nombre de degrés de préparation de surface mais ne spécifie aucune exigence relative à l'état du subjectile avant la préparation de surface.
ISO 12944-4:2017 ne couvre pas les surfaces fortement polies ni les surfaces écrouies.
Barve in laki - Protikorozijska zaščita jeklenih konstrukcij z zaščitnimi premaznimi sistemi - 4. del: Vrste površine in priprava površine (ISO 12944-4:2017)
Ta dokument zajema naslednje vrste površin jeklenih konstrukcij iz ogljika ali nizko legiranega
jekla in njihove priprave:
– nepremazane površine;
– površine, ki so toplotno obdelane s cinkom, aluminijem ali njunimi zlitinami;
– vroče galvanizirane površine;
– s cinkom galvanizirane površine;
– šeradirane površine;
– površine, premazane z osnovnim premazom;
– druge premazane površine.
V tem dokumentu so opredeljene številne stopnje priprave površine, vendar niso določene nobene zahteve
za stanje podloge pred pripravo površine.
Ta dokument ne zajema intenzivno poliranih površin in utrjenih delovnih površin.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 12944-4:2018
01-februar-2018
1DGRPHãþD
SIST EN ISO 12944-4:1998
%DUYHLQODNL3URWLNRUR]LMVND]DãþLWDMHNOHQLKNRQVWUXNFLM]]DãþLWQLPLSUHPD]QLPL
VLVWHPLGHO 9UVWHSRYUãLQHLQSULSUDYDSRYUãLQH ,62
Paints and varnishes - Corrosion protection of steel structures by protective paint
systems - Part 4: Types of surface and surface preparation (ISO 12944-4:2017)
Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme -
Teil 4: Arten von Oberflächen und Oberflächenvorbereitung (ISO 12944-4:2017)
Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture -
Partie 4: Types de surface et de préparation de surface (ISO 12944-4:2017)
Ta slovenski standard je istoveten z: EN ISO 12944-4:2017
ICS:
25.220.10 Priprava površine Surface preparation
87.040 Barve in laki Paints and varnishes
91.080.13 Jeklene konstrukcije Steel structures
SIST EN ISO 12944-4:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 12944-4:2018
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SIST EN ISO 12944-4:2018
EN ISO 12944-4
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2017
EUROPÄISCHE NORM
ICS 25.220.10; 87.020; 91.080.13 Supersedes EN ISO 12944-4:1998
English Version
Paints and varnishes - Corrosion protection of steel
structures by protective paint systems - Part 4: Types of
surface and surface preparation (ISO 12944-4:2017)
Peintures et vernis - Anticorrosion des structures en Beschichtungsstoffe - Korrosionsschutz von
acier par systèmes de peinture - Partie 4: Types de Stahlbauten durch Beschichtungssysteme - Teil 4:
surface et de préparation de surface (ISO 12944- Arten von Oberflächen und Oberflächenvorbereitung
4:2017) (ISO 12944-4:2017)
This European Standard was approved by CEN on 30 October 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: Rue de la Science 23, B-1040 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12944-4:2017 E
worldwide for CEN national Members.
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SIST EN ISO 12944-4:2018
EN ISO 12944-4:2017 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 12944-4:2018
EN ISO 12944-4:2017 (E)
European foreword
This document (EN ISO 12944-4:2017) 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 June 2018, and conflicting national standards shall be
withdrawn at the latest by June 2018.
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 12944-4:1998.
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 12944-4:2017 has been approved by CEN as EN ISO 12944-4:2017 without any
modification.
3
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SIST EN ISO 12944-4:2018
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SIST EN ISO 12944-4:2018
INTERNATIONAL ISO
STANDARD 12944-4
Second edition
2017-11
Paints and varnishes — Corrosion
protection of steel structures by
protective paint systems —
Part 4:
Types of surface and surface
preparation
Peintures et vernis — Anticorrosion des structures en acier par
systèmes de peinture —
Partie 4: Types de surface et de préparation de surface
Reference number
ISO 12944-4:2017(E)
©
ISO 2017
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SIST EN ISO 12944-4:2018
ISO 12944-4:2017(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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 12944-4:2018
ISO 12944-4:2017(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General . 4
5 Types of surface to be prepared . 4
5.1 General . 4
5.2 Uncoated surfaces . 4
5.3 Metal-coated surfaces . 4
5.3.1 Thermally sprayed surfaces . 4
5.3.2 Hot-dip-galvanized surfaces . 4
5.3.3 Zinc-electroplated surfaces . 4
5.3.4 Sherardized surfaces . 5
5.4 Surfaces painted with prefabrication primer . 5
5.5 Other painted surfaces . 5
5.6 Surfaces with chemical treatment . 5
6 Surface preparation methods . 5
6.1 General . 5
6.2 Water, solvent and chemical cleaning. 5
6.2.1 Water cleaning . 5
6.2.2 Steam cleaning . 5
6.2.3 Emulsion cleaning . . . 6
6.2.4 Alkaline cleaning . 6
6.2.5 Organic-solvent cleaning . 6
6.2.6 Stripping. 6
6.2.7 Acid pickling . 6
6.2.8 Chemical treatment . 6
6.3 Mechanical cleaning . 6
6.3.1 Hand-tool cleaning . 6
6.3.2 Power-tool cleaning . 6
6.3.3 Blast-cleaning . 7
6.3.4 Water jetting . 8
7 Surface preparation grades . 8
7.1 General . 8
7.2 Uncoated surfaces . 9
7.3 Metal-coated surfaces . 9
7.4 Surfaces painted with prefabrication primer . 9
7.5 Other painted surfaces . 9
8 Surface profile (roughness) and surface profile grading .10
9 Assessment of prepared surfaces .10
10 Temporary protection of prepared surfaces from corrosion and/or contamination .10
11 Preparation of temporarily or partly protected surfaces before application of
further coatings .10
12 Preparation of hot-dip-galvanized surfaces .11
12.1 Unweathered surfaces .11
12.2 Weathered surfaces .11
13 Preparation of thermally sprayed metal (zinc and aluminium) surfaces .11
© ISO 2017 – All rights reserved iii
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SIST EN ISO 12944-4:2018
ISO 12944-4:2017(E)
14 Preparation of zinc-electroplated and sherardized surfaces .11
15 Preparation of other coated surfaces .12
16 Recommendations regarding pollution and the environment .12
17 Health and safety .12
Annex A (normative) Standard preparation grades for primary (overall) surface preparation .13
Annex B (normative) Standard preparation grades for secondary (partial) surface preparation .15
Annex C (informative) Procedures for removal of extraneous layers and foreign matter,
native layers and contaminants .17
Bibliography .19
iv © ISO 2017 – All rights reserved
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SIST EN ISO 12944-4:2018
ISO 12944-4:2017(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: 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 second edition cancels and replaces the first edition (ISO 12944-4:1998), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— the terms and definitions which were not used in the main part of the standard have been deleted;
— the normative references have been updated;
— 5.6 “Surfaces with chemical treatment” has been included;
— 6.2.8 “Chemical treatment” has been included;
— Annex C has been restructured to contain two tables for distinction between “extraneous layers
and foreign matter” and “native layers and contaminants”;
— the bibliography has been updated;
— the text has been editorially revised.
A list of all parts in the ISO 12944 series can be found on the ISO website.
© ISO 2017 – All rights reserved v
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SIST EN ISO 12944-4:2018
ISO 12944-4:2017(E)
Introduction
Unprotected steel in the atmosphere, in water and in soil is subjected to corrosion that can lead to
damage. Therefore, to avoid corrosion damage, steel structures are normally protected to withstand
the corrosion stresses to which they will be subjected during the 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 describes the different types of surface to be protected and gives information on surface
preparation methods such as chemical and mechanical cleaning. It deals with surface preparation
grades, surface profile (roughness), assessment of prepared surfaces, temporary protection of
prepared surfaces, preparation of temporarily protected surfaces for further coatings, preparation of
existing metal coatings, and environmental aspects. As far as possible, reference is made to the basic
International Standards on the surface preparation of steel substrates before application of paints and
related products.
vi © ISO 2017 – All rights reserved
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SIST EN ISO 12944-4:2018
INTERNATIONAL STANDARD ISO 12944-4:2017(E)
Paints and varnishes — Corrosion protection of steel
structures by protective paint systems —
Part 4:
Types of surface and surface preparation
1 Scope
This document covers the following types of surfaces of steel structures consisting of carbon or low-
alloy steel, and their preparation:
— uncoated surfaces;
— surfaces thermally sprayed with zinc, aluminium or their alloys;
— hot-dip-galvanized surfaces;
— zinc-electroplated surfaces;
— sherardized surfaces;
— surfaces painted with prefabrication primer;
— other painted surfaces.
This document defines a number of surface preparation grades but does not specify any requirements
for the condition of the substrate prior to surface preparation.
Highly polished surfaces and work-hardened surfaces are not covered by this document.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and
designation system
ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of
blistering
ISO 4628-3, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and
size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of degree of rusting
ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of
cracking
© ISO 2017 – All rights reserved 1
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SIST EN ISO 12944-4:2018
ISO 12944-4:2017(E)
ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and
size of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking
ISO 4628-6, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 6: Assessment of degree of
chalking by tape method
ISO 8501-1:2007, 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 8501-2:1994, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 2: Preparation grades of previously coated steel substrates after
localized removal of previous coatings
ISO 8501-3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
ISO 8501-4, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 4: Initial surface conditions, preparation grades and flash rust
grades in connection with high-pressure water jetting
ISO 8504 (all parts), Preparation of steel substrates before application of paints and related products —
Surface preparation methods
ISO 12944-1, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —
Part 1: General introduction
ISO 16276 (all parts), Corrosion protection of steel structures by protective paint systems — Assessment of,
and acceptance criteria for, the adhesion/cohesion (fracture strength) of a coating
EN 10238, Automatically blast-cleaned and automatically prefabrication primed structural steel products
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:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
abrasive blast-cleaning
impingement of a high-kinetic-energy stream of blast-cleaning abrasive (3.2) on to the surface to be
prepared
[SOURCE: ISO 11124-1:1993, 2.2]
3.2
blast-cleaning abrasive
solid material intended to be used for abrasive blast-cleaning (3.1)
[SOURCE: ISO 11124-1:1993, 2.1]
2 © ISO 2017 – All rights reserved
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SIST EN ISO 12944-4:2018
ISO 12944-4:2017(E)
3.3
dust
loose particulate matter present on a steel surface prepared for painting, arising from blast-cleaning
(3.1) or other surface preparation processes, or resulting from the action of the environment
[SOURCE: ISO 8502-3:2017, 3.1]
3.4
dew point
temperature at which moisture in the air will condense out on to a solid surface
Note 1 to entry: See ISO 8502-4.
3.5
flash rusting
slight rust formation on a prepared steel surface soon after preparation
3.6
grit
particles that are predominantly angular, that have fractured faces and sharp edges and that are less
than half-round in shape
[SOURCE: ISO 11124-1:1993, 2.4]
3.7
mill scale
heavy oxide layer formed during hot fabrication or heat treatment of steel
3.8
rust
visible corrosion products consisting, in the case of ferrous metals, mainly of hydrated iron oxides
3.9
shot
particles that are predominantly round, that have a length of less than twice the maximum particle
width and that do not have edges, broken faces or other sharp surface defects
[SOURCE: ISO 11124-1:1993, 2.3]
3.10
substrate
surface to which a coating material is applied or is to be applied
[SOURCE: ISO 4618:2014, 2.244]
3.11
surface preparation
method of preparing a surface for coating
3.12
white rust
white to dark grey corrosion products on zinc-coated surfaces
3.13
chemical treatment
surface treatment process, based on a chemical or electrochemical reaction, which superficially
modifies the metal substrate (3.10)
© ISO 2017 – All rights reserved 3
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...
SLOVENSKI STANDARD
oSIST prEN ISO 12944-4:2016
01-julij-2016
%DUYHLQODNL.RUR]LMVND]DãþLWDMHNOHQLKNRQVWUXNFLM]]DãþLWQLPLSUHPD]QLPL
VLVWHPLGHO 7LSLSRYUãLQLQSULSUDYDSRYUãLQH ,62',6
Paints and varnishes - Corrosion protection of steel structures by protective paint
systems - Part 4: Types of surface and surface preparation (ISO/DIS 12944-4:2016)
Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme -
Teil 4: Arten von Oberflächen und Oberflächenvorbereitung (ISO/DIS 12944-4:2016)
Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture -
Partie 4: Types de surface et de préparation de surface (ISO/DIS 12944-4:2016)
Ta slovenski standard je istoveten z: prEN ISO 12944-4
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
oSIST prEN ISO 12944-4:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 12944-4:2016
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oSIST prEN ISO 12944-4:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12944-4
ISO/TC 35/SC 14 Secretariat: DIN
Voting begins on: Voting terminates on:
2016-05-19 2016-08-18
Paints and varnishes — Corrosion protection of steel
structures by protective paint systems —
Part 4:
Types of surface and surface preparation
Peintures et vernis — Anticorrosion des structures en acier par systèmes de peinture —
Partie 4: Types de surface et de préparation de surface
ICS: 25.220.10
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12944-4:2016(E)
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 SUPPORTING DOCUMENTATION. ISO 2016
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oSIST prEN ISO 12944-4:2016
ISO/DIS 12944-4:2016(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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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oSIST prEN ISO 12944-4:2016
ISO/DIS 12944-4:2016(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General . 3
5 Types of surface to be prepared . 4
5.1 General . 4
5.2 Uncoated surfaces . 4
5.3 Metal-coated surfaces . 4
5.3.1 Thermally sprayed surfaces . 4
5.3.2 Hot-dip-galvanized surfaces . 4
5.3.3 Zinc-electroplated surfaces . 4
5.3.4 Sherardized surfaces . 4
5.4 Surfaces painted with prefabrication primer . 4
5.5 Other painted surfaces . 5
5.6 Surfaces with chemical treatment . 5
6 Surface preparation methods . 5
6.1 General . 5
6.2 Water, solvent and chemical cleaning. 5
6.2.1 Water cleaning . 5
6.2.2 Steam cleaning . 5
6.2.3 Emulsion cleaning . . . 5
6.2.4 Alkaline cleaning . 5
6.2.5 Organic-solvent cleaning . 6
6.2.6 Stripping. 6
6.2.7 Acid pickling . 6
6.2.8 Chemical treatment . 6
6.3 Mechanical cleaning . 6
6.3.1 Hand-tool cleaning . 6
6.3.2 Power-tool cleaning . 6
6.3.3 Blast-cleaning . 6
6.3.4 Water jetting . 8
7 Surface preparation grades . 8
7.1 General . 8
7.2 Uncoated surfaces . 9
7.3 Metal-coated surfaces . 9
7.4 Surfaces painted with prefabrication primer . 9
7.5 Other painted surfaces . 9
8 Surface profile (roughness) and surface profile grading .10
9 Assessment of prepared surfaces .10
10 Temporary protection of prepared surfaces from corrosion and/or contamination .10
11 Preparation of temporarily or partly protected surfaces before application of
further coatings .10
12 Preparation of hot-dip-galvanized surfaces .10
12.1 Unweathered surfaces .10
12.2 Weathered surfaces .11
13 Preparation of thermally sprayed metal (zinc and aluminium) surfaces .11
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ISO/DIS 12944-4:2016(E)
14 Preparation of zinc-electroplated and sherardized surfaces .11
15 Preparation of other coated surfaces .11
16 Recommendations regarding pollution and the environment .12
17 Health and safety .12
Annex A (normative) Standard preparation grades for primary (overall) surface preparation .13
Annex B (normative) Standard preparation grades for secondary (partial) surface preparation .15
Annex C (informative) Procedures for removal of extraneous layers and foreign matter .18
Bibliography .20
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oSIST prEN ISO 12944-4:2016
ISO/DIS 12944-4:2016(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 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 35, Paints and varnishes, Subcommittee SC 14,
Protective paint systems for steel structures.
ISO 12944 consists of the following parts, under the general title Paints and varnishes — Corrosion
protection of steel structures by protective paint systems:
— Part 1: General introduction
— Part 2: Classification of environments
— Part 3: Design considerations
— Part 4: Types of surface and surface preparation
— Part 5: Protective paint systems
— Part 6: Laboratory performance test methods
— Part 7: Execution and supervision of paint work
— Part 8: Development of specifications for new work and maintenance
— Part 9: Protective paint systems and laboratory performance test methods for offshore and related
structures
Annexes A and B form an integral part of this part of ISO 12944. Annexe C is for information only.
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oSIST prEN ISO 12944-4:2016
ISO/DIS 12944-4:2016(E)
Introduction
Unprotected steel in the atmosphere, in water and in soil is subject to corrosion that may lead to
damage. Therefore, to avoid corrosion damage, steel structures are normally protected to withstand
the corrosion stresses during the service life required of the structure.
There are different ways of protecting steel structures from corrosion. ISO 12944 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, it is necessary for owners of such
structures, planners, consultants, companies carrying out corrosion protection work, inspectors of
protective coatings and manufacturers of coating materials to have at their disposal state-of-the-art
information in concise form on corrosion protection by paint systems. Such information has to be as
complete as possible, unambiguous and easily understandable to avoid difficulties and misunderstandings
between the parties concerned with the practical implementation of protection work.
This International Standard — ISO 12944-4:— 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 is familiar with other relevant International Standards, in particular those
dealing with surface preparation, as well as relevant national regulations.
Although ISO 12944 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 this standard may result in serious financial
consequences.
ISO 12944-1 defines the overall scope of all parts 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 for a given project.
This part of ISO 12944 describes different types of surface to be protected and gives information
on surface preparation methods such as chemical and mechanical cleaning. It deals with surface
preparation grades, surface profile (roughness), assessment of prepared surfaces, temporary protection
of prepared surfaces, preparation of temporarily protected surfaces for further coatings, preparation
of existing metal coatings, and environmental aspects. As far as possible, reference is made to the basic
International Standards on the surface preparation of steel substrates before application of paints and
related products.
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oSIST prEN ISO 12944-4:2016
DRAFT INTERNATIONAL STANDARD ISO/DIS 12944-4:2016(E)
Paints and varnishes — Corrosion protection of steel
structures by protective paint systems —
Part 4:
Types of surface and surface preparation
1 Scope
This part of ISO 12944 deals with the following types of surfaces of steel structures consisting of
carbon or low-alloy steel, and their preparation:
— uncoated surfaces;
— surfaces thermally sprayed with zinc, aluminium or their alloys;
— hot-dip-galvanized surfaces;
— zinc-electroplated surfaces;
— sherardized surfaces;
— surfaces painted with prefabrication primer;
— other painted surfaces.
This part of ISO 12944 defines a number of surface preparation grades but does not specify any
requirements for the condition of the substrate prior to surface preparation.
Highly polished surfaces and work-hardened surfaces are not covered by this part of ISO 12944.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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, Thermal spraying — Metallic and other inorganic coatings — Zinc, aluminium and their alloys
ISO 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and
designation system
ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of
blistering
ISO 4628-3, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and
size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of degree of rusting
ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of
cracking
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oSIST prEN ISO 12944-4:2016
ISO/DIS 12944-4:2016(E)
ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and
size of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking
ISO 4628-6, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 6: Assessment of degree of
chalking by tape method
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 8501-2:1994, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 2: Preparation grades of previously coated steel substrates after
localized removal of previous coatings
ISO 8501-3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
ISO 8501-4, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 4: Initial surface conditions, preparation grades and flash rust
grades in connection with high-pressure water jetting
ISO 8504-2, Preparation of steel substrates before application of paints and related products — Surface
preparation methods — Part 2: Abrasive blast-cleaning
ISO 12944-1, Paints and varnishes — Corrosion protection of steel structures by protective coating
systems — Part 1: General introduction
EN 10238, Automatically blast-cleaned and automatically prefabrication primed structural steel products
3 Terms and definitions
For the purposes of this part of ISO 12944, the following definitions apply in addition to those given in
ISO 12944-1.
3.1
abrasive blast-cleaning
impingement of a high-kinetic-energy stream of blast-cleaning abrasive on to the surface to be prepared
3.2
blast-cleaning abrasive
solid material intended to be used for abrasive blast-cleaning
[SOURCE: ISO 11124-1:1993, 2.1; ISO 11126-1:1993, 2.1]
3.3
dust
loose particulate matter present on a steel surface prepared for painting, arising from blast-cleaning or
other surface preparation processes, or resulting from the action of the environment
[SOURCE: ISO 8502-3:1992, 3.1]
3.4
dew point
the temperature at which moisture in the air will condense out on to a solid surface
Note 1 to entry: See ISO 8502-4.
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oSIST prEN ISO 12944-4:2016
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3.5
flash rusting
slight rust formation on a prepared steel surface soon after preparation
3.6
grit
particles that are predominantly angular, that have fractured faces and sharp edges and that are less
than half-round in shape
[SOURCE: ISO 11124-1:1993, 2.4; ISO 11126-1:1993, 2.4]
3.7
mill scale
heavy oxide layer formed during hot fabrication or heat treatment of steel
3.8
rust
visible corrosion products consisting, in the case of ferrous metals, mainly of hydrated iron oxides
3.9
shot
particles that are predominantly round, that have a length of less than twice the maximum particle
width and that do not have edges, broken faces or other sharp surface defects
[SOURCE: ISO 11124-1:1993, 2.3; ISO 11126-1:1993, 2.3]
3.10
substrate
surface to which a coating material is applied or is to be applied
[SOURCE: ISO 4618:2014, 2.244]
3.11
surface preparation
method of preparing a surface for coating
3.12
white rust
white to dark grey corrosion products on zinc-coated surfaces
3.13
chemical treatment
surface treatment process, based on a chemical or electrochemical reaction, which superficially
modified the metal substrate
4 General
The primary objective of surface preparation is to ensure the removal of matter which negatively affects
the corrosion protection and to obtain a surface that permits satisfactory adhesion of the coating to the
surface. It will also assist in reducing the amounts of contaminants that initiate corrosion.
It is stressed that there is a very wide variation in the condition of steel surfaces requiring cleaning
prior to painting. This particularly applies to maintenance of an already coated structure. The age
of the structure and its location, the quality of the previous surface, the performance of the existing
coating system and the extent of breakdown, the type and severity of previous and future corrosion
environments, and the intended new coating system all influence the amount of preparation required.
When selecting a surface preparation method, it is necessary to consider the preparation grade
(according to this standard) required to give a level of surface cleanliness and, if required, a surface
profile (roughness) appropriate to the coating system to be applied to the steel surface.
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oSIST prEN ISO 12944-4:2016
ISO/DIS 12944-4:2016(E)
Personnel carrying out surface preparation work shall have suitable equipment and sufficient
technical knowledge of the processes involved to enable them to carry out the work in accordance with
the required specification. It is important that the surfaces to be treated are readily accessible and
sufficiently illuminated. All surface preparation work shall be properly supervised and inspected.
If the specified preparation grade has not been achieved by the preparation method selected or when
the condition of the prepared surface has subsequently changed before the application of the coating
system, relevant parts of the procedure shall be repeated so as to obtain the specified preparation grade.
Details regarding the preliminary treatment of welds, the removal of weld spatter and removal of burrs
and other sharp edges shall be in accordance with ISO 8501-3. Details are given in ISO 12944-3. These
measures should normally be taken in connection with the manufacturing process before the surface
preparation.
NOTE For further details, see ISO 8504-1.
5 Types of surface to be prepared
5.1 General
The surfaces to be prepared are divided according to the following sub-clauses.
5.2 Uncoated surfaces
Uncoated surfaces consist of bare steel, which may be covered by mill scale or rust and other
contaminants. They shall be assessed in accordance with ISO 8501-1 (rust grades A, B, C and D).
5.3 Metal-coated surfaces
5.3.1 Thermally sprayed surfaces
Thermally sprayed surfaces consist of steel coated with zinc, aluminium or their alloys by flame or arc
spraying in accordance with ISO 2063.
5.3.2 Hot-dip-galvanized surfaces
Hot-dip-galvanized surfaces consist of steel coated with zinc or zinc alloy by immersion in a molten
bath in accordance with ISO 1461.
5.3.3 Zinc-electroplated surfaces
Zinc-electroplated surfaces consist of steel coated with an electrodeposited zinc coating.
5.3.4 Sherardized surfaces
Sherardized surfaces consist of steel coated with zinc-iron alloy layers obtained by heating the steel
component in a container together with zinc dust.
5.4 Surfaces painted with prefabrication primer
Surfaces painted
...
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