Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 2: Classification of environments (ISO 12944-2:2017)

ISO 12944-2:2017 deals with the classification of the principal environments to which steel structures are exposed, and the corrosivity of these environments. ISO 12944-2:2017
-      defines atmospheric-corrosivity categories, based on mass loss (or thickness loss) by standard specimens, and describes typical natural atmospheric environments to which steel structures are exposed, giving advice on the estimation of the corrosivity,
-      describes different categories of environment for structures immersed in water or buried in soil, and
-      gives information on some special corrosion stresses that can cause a significant increase in corrosion rate or place higher demands on the performance of the protective paint system.
The corrosion stresses associated with a particular environment or corrosivity category represent one essential parameter governing the selection of protective paint systems.

Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme - Teil 2: Einteilung der Umgebungsbedingungen (ISO 12944-2:2017)

Dieses Dokument beschreibt die häufigsten Umgebungsbedingungen, denen Stahlbauten ausgesetzt sind, und nimmt eine Einteilung dieser Umgebungsbedingungen anhand ihrer Korrosivität vor. Dieses Dokument enthält
—   eine Aufstellung von Kategorien atmosphärischer Korrosivität basierend auf dem Massenverlust (beziehungsweise Dickenverlust) von Standardproben mit Beschreibung typischer natürlicher atmosphärischer Umgebungsbedingungen, denen Stahlbauten ausgesetzt sind, wobei Hinweise zur Bestimmung der Korrosivität gegeben werden,
—   eine Beschreibung der verschiedenen Kategorien von Umgebungsbedingungen für Stahlbauten, die sich in Wasser oder Erdreich befinden und
—   Informationen zu besonderen Korrosionsbelastungen, die Korrosion wesentlich befördern oder eine höhere Leistungsfähigkeit des Beschichtungssystems erforderlich machen können.
Die mit einer bestimmten Umgebung oder Korrosivitätskategorie verbundenen Korrosionsbelastungen sind ein wesentlicher Parameter für die Auswahl des Beschichtungssystems.

Peintures et vernis - Anticorrosion des structures en acier par systèmes de peinture - Partie 2: Classification des environnements (ISO 12944-2:2017)

ISO 12944-2:2017 traite de la classification des principaux environnements auxquels sont exposées les structures en acier peintes et de la corrosivité de ces environnements. Le présent document
-      définit les catégories de corrosivité atmosphérique, basées sur la perte de masse (ou la perte d'épaisseur) au moyen d'éprouvettes standard, et décrit les environnements atmosphériques naturels types auxquels sont exposées les structures en acier, en donnant des conseils pour l'estimation de la corrosivité,
-      décrit différentes catégories d'environnement pour les structures immergées ou enterrées, et
-      fournit des informations sur certaines contraintes de corrosion particulières, susceptibles d'augmenter de façon significative la vitesse de corrosion ou de nécessiter une plus grande performance du système de peinture.
Des contraintes de corrosion associées à un environnement particulier ou à une catégorie de corrosivité représentent un paramètre essentiel pour le choix de systèmes de peinture.

Barve in laki - Protikorozijska zaščita jeklenih konstrukcij z zaščitnimi premaznimi sistemi - 2. del: Klasifikacija okoljskih pogojev (ISO 12944-2:2017)

ISO 12944-2:2017 obravnava klasifikacijo glavnih okoljskih pogojev, ki so jim izpostavljene jeklene konstrukcije, in korozivnost teh pogojev. ISO 12944-2:2017
- opredeljuje kategorije atmosferske korozivnosti na podlagi izgube mase (ali debeline) s standardnimi vzorci in opisuje običajne naravne atmosferske okoljske pogoje, ki so jim izpostavljene jeklene konstrukcije, ter podaja nasvete glede vrednotenja korozivnosti;
- opisuje različne kategorije okoljskih pogojev za konstrukcije, potopljene v vodo ali zakopane v zemljo; in
- podaja informacije o nekaterih posebnih korozijskih obremenitvah, ki lahko povzročijo znatno povečanje stopnje korozije ali postavijo višje zahteve glede učinkovitosti zaščitnega premaznega sistema.
Korozijske obremenitve, povezane z določenimi okoljskimi pogoji ali kategorijo korozivnosti, predstavljajo enega od osnovnih parametrov, ki vplivajo na izbiro zaščitnih premaznih sistemov.

General Information

Status
Withdrawn
Publication Date
30-Mar-2018
Withdrawal Date
19-Jun-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
20-Dec-2017
Completion Date
20-Dec-2017

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SLOVENSKI STANDARD
SIST EN ISO 12944-2:2018
01-februar-2018
1DGRPHãþD
SIST EN ISO 12944-2:1998

%DUYHLQODNL3URWLNRUR]LMVND]DãþLWDMHNOHQLKNRQVWUXNFLM]]DãþLWQLPLSUHPD]QLPL

VLVWHPLGHO.ODVLILNDFLMDRNROMVNLKSRJRMHY ,62

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

systems - Part 2: Classification of environments (ISO 12944-2:2017)

Beschichtungsstoffe - Korrosionsschutz von Stahlbauten durch Beschichtungssysteme -

Teil 2: Einteilung der Umgebungsbedingungen (ISO 12944-2:2017)

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

Partie 2: Classification des environnements (ISO 12944-2:2017)
Ta slovenski standard je istoveten z: EN ISO 12944-2:2017
ICS:
25.220.20 Površinska obdelava Surface treatment
87.040 Barve in laki Paints and varnishes
91.080.13 Jeklene konstrukcije Steel structures
SIST EN ISO 12944-2:2018 en,fr,de

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

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SIST EN ISO 12944-2:2018
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SIST EN ISO 12944-2:2018
EN ISO 12944-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2017
EUROPÄISCHE NORM
ICS 87.020; 91.080.13 Supersedes EN ISO 12944-2:1998
English Version
Paints and varnishes - Corrosion protection of steel
structures by protective paint systems - Part 2:
Classification of environments (ISO 12944-2:2017)

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

acier par systèmes de peinture - Partie 2: Classification Stahlbauten durch Beschichtungssysteme - Teil 2:

des environnements (ISO 12944-2:2017) Einteilung der Umgebungsbedingungen (ISO 12944-

2:2017)
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 12944-2:2017 E

worldwide for CEN national Members.
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SIST EN ISO 12944-2:2018
EN ISO 12944-2:2017 (E)
Contents Page

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

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SIST EN ISO 12944-2:2018
EN ISO 12944-2:2017 (E)
European foreword

This document (EN ISO 12944-2:2017) 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 12944-2:1998.

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 12944-2:2017 has been approved by CEN as EN ISO 12944-2:2017 without any

modification.
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SIST EN ISO 12944-2:2018
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SIST EN ISO 12944-2:2018
INTERNATIONAL ISO
STANDARD 12944-2
Second edition
2017-11
Paints and varnishes — Corrosion
protection of steel structures by
protective paint systems —
Part 2:
Classification of environments
Peintures et vernis — Anticorrosion des structures en acier par
systèmes de peinture —
Partie 2: Classification des environnements
Reference number
ISO 12944-2:2017(E)
ISO 2017
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SIST EN ISO 12944-2:2018
ISO 12944-2:2017(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
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SIST EN ISO 12944-2:2018
ISO 12944-2:2017(E)
Contents Page

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

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Corrosion stresses due to the atmosphere, water and soil ...................................................................................... 3

4.1 Atmospheric corrosion .................................................................................................................................................................... 3

4.2 Corrosion in water and soil .......................................................................................................................................................... 3

4.2.1 General...................................................................................................................................................................................... 3

4.2.2 Structures immersed in water ............................................................................................................................. 3

4.2.3 Structures buried in soil ............................................................................................................................................ 4

4.3 Special cases .............................................................................................................................................................................................. 4

5 Classification of environments .............................................................................................................................................................. 4

5.1 Atmospheric-corrosivity categories ..................................................................................................................................... 4

5.2 Categories for water and soil ...................................................................................................................................................... 5

Annex A (informative) Climatic conditions .................................................................................................................................................... 7

Annex B (informative) Special cases ..................................................................................................................................................................... 8

Bibliography .............................................................................................................................................................................................................................11

© ISO 2017 – All rights reserved iii
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SIST EN ISO 12944-2:2018
ISO 12944-2:2017(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 12944-2:1998), which has been

technically revised.
The main changes compared to the previous edition are as follows:
— the normative references have been updated;
— 4.2.1 "General" has been added;
— the units in Table 1 have been corrected;
— 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.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 12944-2:2018
ISO 12944-2:2017(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 environmental impact on steel structures. It covers structures exposed

to the atmosphere as well as those immersed in water or buried in soil. For different atmospheric

environments, a classification system based on corrosivity categories is also presented. Different

environments for immersed and buried structures are also described. All these environments are

relevant to the choice of protective paint systems.
© ISO 2017 – All rights reserved v
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SIST EN ISO 12944-2:2018
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SIST EN ISO 12944-2:2018
INTERNATIONAL STANDARD ISO 12944-2:2017(E)
Paints and varnishes — Corrosion protection of steel
structures by protective paint systems —
Part 2:
Classification of environments
1 Scope

This document deals with the classification of the principal environments to which steel structures are

exposed, and the corrosivity of these environments. This document

— defines atmospheric-corrosivity categories, based on mass loss (or thickness loss) by standard

specimens, and describes typical natural atmospheric environments to which steel structures are

exposed, giving advice on the estimation of the corrosivity,

— describes different categories of environment for structures immersed in water or buried in soil, and

— gives information on some special corrosion stresses that can cause a significant increase in

corrosion rate or place higher demands on the performance of the protective paint system.

The corrosion stresses associated with a particular environment or corrosivity category represent one

essential parameter governing the selection of protective paint systems.
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 12944-1, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 1: General introduction

ISO 12944-3, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 3: Design considerations

ISO 12944-4, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 4: Types of surface and surface preparation

ISO 12944-5, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 5: Protective paint systems

ISO 12944-6, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 6: Laboratory performance test methods

ISO 12944-7, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 7: Execution and supervision of paint work

ISO 12944-8, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 8: Development of specifications for new work and maintenance

ISO 12944-9, Paints and varnishes — Corrosion protection of steel structures by protective paint

systems — Part 9: Protective paint systems and laboratory performance test methods for offshore and

related structures
© ISO 2017 – All rights reserved 1
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SIST EN ISO 12944-2:2018
ISO 12944-2:2017(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12944-1, ISO 12944-3,

ISO 12944-4, ISO 12944-5, ISO 12944-6, ISO 12944-7, ISO 12944-8, ISO 12944-9 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
corrosivity

ability of an environment to cause corrosion of a metal in a given corrosion system

[SOURCE: ISO 8044:2015, 2.
...

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