prEN ISO 21207

SLOVENSKI STANDARD
01-julij-2024
Korozijski preskusi v umetnih atmosferah - Pospešeni korozijski preskusi, ki
vključujejo izmenično izpostavljenost plinom, ki spodbujajo korozijo, nevtralnemu
razprševanju soli in sušenju (ISO/DIS 21207:2024)
Corrosion tests in artificial atmospheres - Accelerated corrosion tests involving alternate
exposure to corrosion-promoting gases, neutral salt-spray and drying (ISO/DIS
21207:2024)
Korrosionsprüfungen in künstlichen Atmosphären - Beschleunigte Korrosionstests mit
alternativer Einwirkung von korrosionsfördernden Gasen, neutraler Salzsprühung und
Trocknung (ISO/DIS 21207:2024)
Essais de corrosion en atmosphères artificielles - Essais de corrosion accélérée par
expositions alternées à des gaz favorisant la corrosion ou au brouillard salin neutre et à
un séchage (ISO/DIS 21207:2024)
Ta slovenski standard je istoveten z: prEN ISO 21207
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 21207
ISO/TC 156
Corrosion tests in artificial
Secretariat: SAC
atmospheres — Accelerated
Voting begins on:
corrosion tests involving alternate
2024-06-05
exposure to corrosion-promoting
Voting terminates on:
gases, neutral salt-spray and drying
2024-08-28
Essais de corrosion en atmosphères artificielles — Essais de
corrosion accélérée par expositions alternées à des gaz oxydants
ou au brouillard salin neutre et à un séchage
ICS: 77.060
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 21207:2024(en)
DRAFT
ISO/DIS 21207:2024(en)
International
Standard
ISO/DIS 21207
ISO/TC 156
Corrosion tests in artificial
Secretariat: SAC
atmospheres — Accelerated
Voting begins on:
corrosion tests involving alternate
exposure to corrosion-promoting
Voting terminates on:
gases, neutral salt-spray and drying
Essais de corrosion en atmosphères artificielles — Essais de
corrosion accélérée par expositions alternées à des gaz oxydants
ou au brouillard salin neutre et à un séchage
ICS: 77.060
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 21207:2024(en)
ii
ISO/DIS 21207:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus and reagents . 1
4.1 Exposure of test objects to mixtures of NO and SO .2
2 2
4.2 Salt spray testing in accordance with ISO 9227 .3
4.3 Drying in standard atmosphere .3
5 Evaluation of the corrosivity of the tests . 3
5.1 Reference test panels .3
5.2 Arrangement of the reference panels during testing .3
5.3 Determination of mass loss after testing .3
5.4 Satisfactory performance of test .4
6 Test objects . 4
7 Procedure . 5
7.1 Test method A .5
7.1.1 Test cycle .5
7.1.2 Salt spray testing followed by drying (step a).5
7.1.3 Exposure to corrosive gases followed by drying (step b) .5
7.1.4 Test duration .6
7.2 Test method B .6
7.2.1 Test cycle .6
7.2.2 Salt spray testing followed by drying (step a or step c) .6
7.2.3 Exposure to corrosive gases (step b or step d) .6
7.2.4 Test duration .7
8 Evaluation of results . 7
9 Test report . 7
Annex A (informative) Recommended test periods . 9
Annex B (informative) Results from Interlaboratory comparison .10
Bibliography .11

iii
ISO/DIS 21207:2024(en)
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 WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information
This document was prepared by Technical Committee ISO/TC 156 Corrosion of metals and alloys.
This third edition cancels and replaces the second edition (ISO 21207:2015).
The main changes compared to the previous edition are as follows:
— Table A2 has been withdrawn.
— Annex B has been added. This annex includes an interlaboratory comparison, comprising three
laboratories.
— The dispersion limits of Cu mass loss have been increased to 30 % in Table 1.
These methods (A and B) are not intended to be used for comparative testing as a means of ranking different
materials relative to each other with respect to corrosion resistance.
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/DIS 21207:2024(en)
Introduction
Corrosion of metallic materials with or without corrosion protection is influenced by many environmental
factors, the importance of which can vary with the type of metallic material and with the type of
environment. Laboratory tests are designed to simulate the effects of the most important factors that
enhance the corrosion of metallic materials.
The accelerated corrosion test methods described in this document, methods A and B, are designed
to simulate and enhance the environmental influence of exposure to an outdoor climate where salt-
contaminated conditions and corrosion-promoting gases from an industrial or a traffic environment occur
which might promote corrosion. Test method A simulates a moderately aggressive traffic environment while
test method B simulates a more severe industrial or traffic environment.
Test method A involves exposure of the test objects to the following test cycle:
a) neutral salt spray testing (ISO 9227) for 2 h in a mist of a sodium chloride salt solution of m
...