EN ISO 11844-1:2020

SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST EN ISO 11844-1:2008
Korozija kovin in zlitin - Klasifikacija notranjih atmosfer z nizko korozivnostjo - 1.
del: Ugotavljanje in ocenjevanje korozivnosti v zaprtih prostorih (ISO 11844-
1:2020)
Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres -
Part 1: Determination and estimation of indoor corrosivity (ISO 11844-1:2020)
Korrosion von Metallen und Legierungen - Einteilung der Korrosivität in Räumen mit
geringer Korrosivität - Teil 1: Bestimmung und Abschätzung der Korrosivität in Räumen
(ISO 11844-1:2020)
Corrosion des métaux et alliages - Classification de la corrosivité faible des atmosphères
d'intérieur - Partie 1: Détermination et estimation de la corrosivité des atmosphères
d'intérieur (ISO 11844-1:2020)
Ta slovenski standard je istoveten z: EN ISO 11844-1:2020
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11844-1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 77.060 Supersedes EN ISO 11844-1:2008
English Version
Corrosion of metals and alloys - Classification of low
corrosivity of indoor atmospheres - Part 1: Determination
and estimation of indoor corrosivity (ISO 11844-1:2020)
Corrosion des métaux et alliages - Classification de la Korrosion von Metallen und Legierungen - Einteilung
corrosivité faible des atmosphères d'intérieur - Partie der Korrosivität in Räumen mit geringer Korrosivität -
1: Détermination et estimation de la corrosivité des Teil 1: Bestimmung und Abschätzung der Korrosivität
atmosphères d'intérieur (ISO 11844-1:2020) in Räumen (ISO 11844-1:2020)
This European Standard was approved by CEN on 25 May 2020.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11844-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11844-1:2020) has been prepared by Technical Committee ISO/TC 156
"Corrosion of metals and alloys" in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys”
the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2020, and conflicting national standards
shall be withdrawn at the latest by December 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 11844-1:2008.
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 11844-1:2020 has been approved by CEN as EN ISO 11844-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 11844-1
Second edition
2020-05
Corrosion of metals and alloys —
Classification of low corrosivity of
indoor atmospheres —
Part 1:
Determination and estimation of
indoor corrosivity
Corrosion des métaux et alliages — Classification de la corrosivité
faible des atmosphères d'intérieur —
Partie 1: Détermination et estimation de la corrosivité des
atmosphères d'intérieur
Reference number
ISO 11844-1:2020(E)
©
ISO 2020
ISO 11844-1:2020(E)
© ISO 2020
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
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 11844-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Classification of corrosivity . 2
5.1 General . 2
5.2 Categories of indoor corrosivity . 3
6 Determination of indoor atmospheric corrosivity . 3
7 Characterization of indoor atmospheres with respect to indoor corrosivity .3
7.1 General . 3
7.2 Estimation of indoor corrosivity . 5
Annex A (informative) Relationship between ISO, IEC and ISA classification systems .8
Annex B (informative) Outdoor and indoor concentrations of some of the most important
pollutants in different types of environments .11
Annex C (informative) General characterization of metal corrosion in indoor atmospheres .12
Annex D (informative) Guidelines for the estimation of indoor corrosivity .15
Bibliography .19
ISO 11844-1:2020(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 156, Corrosion of metals and alloys, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 262, Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of
metals and alloys, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 11844-1:2006), which has been
technically revised. The main changes compared with the previous edition are as follows:
— a reference to the ISO 16000 series in Clause 7 has been added;
— a model that estimates the indoor concentration and deposition of pollutants originating from
outdoors has been added;
— lead has been included as a standard specimen with high sensitivity to vapour organic acids.
A list of all parts in the ISO 11844 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 2020 – All rights reserved

ISO 11844-1:2020(E)
Introduction
Metals, alloys and metallic coatings are subject to atmospheric corrosion under the impact of air
humidity, especially when gaseous and solid substances of atmospheric pollution co-impact. Corrosivity
data are of fundamental importance for derivation of suitable corrosion protection, or for evaluation of
serviceability of metal elements of a product.
ISO 9223 classifies the atmospheric environment into six corrosivity categories.
Low corrosivity indoor atmospheres are indoor atmospheres with C 1 (very low) or C 2 (low) corrosivity
categories in accordance with ISO 9223.
The classification in ISO 9223 is too broad for some purposes in low corrosivity indoor atmospheres,
e.g. places where electronic devices, sophisticated technical products, or works of art and historical
objects are stored.
For such purposes, it is necessary to subdivide the corrosivity categories C 1 (very low) and C 2 (low)
into the indoor corrosivity categories given in this document.
The evaluation of low corrosivity indoor atmospheres can be accomplished by direct determination of
corrosion attack of selected metals (see ISO 11844-2) or by measurement of environmental parameters
(see ISO 11844-3) that can cause corrosion on metals and alloys.
This document describes general procedures for deriv
...