Corrosion tests in artificial atmospheres - Accelerated corrosion tests involving alternate exposure to corrosion-promoting gases, neutral salt-spray and drying (ISO 21207:2015)

This International Standard defines two accelerated corrosion test methods to be used in assessing the
corrosion resistance of products with metals in environments where there is a significant influence of
chloride ions, mainly as sodium chloride from a marine source or by winter road de-icing salt, and of
corrosion-promoting gases from industrial or traffic air pollution.
This International Standard specifies both the test apparatus and test procedures to be used in
executing the accelerated corrosion tests.
The methods are especially suitable for assessing the corrosion resistance of sensitive products with
metals, e.g. electronic components, used in traffic and industrial environments.

Korrosionsprüfungen in künstlichen Atmosphären - Beschleunigte Korrosionstests mit alternativer Einwirkung von korrosionsfördernden Gasen, neutraler Salzsprühung und Trocknung (ISO 21207:2015)

Diese Internationale Norm legt zwei beschleunigte Korrosionsprüfverfahren fest, die bei der Beurteilung der Korrosionsbeständigkeit von metallhaltigen Produkten in Umgebungen anzuwenden sind, in denen ein signifikanter Einfluss von Chloridionen, hauptsächlich in Form von Natriumchlorid aus marinen Quellen oder durch Auftausalz für den Straßenwinterdienst, und von korrosionsbegünstigenden Gasen aus industrie- oder verkehrsbedingter Luftverschmutzung vorliegt.
Diese Internationale Norm legt sowohl die Prüfeinrichtungen als auch die Prüfverfahren fest, die bei der Ausführung der beschleunigten Korrosionsversuche anzuwenden sind.
Die Verfahren sind besonders für die Beurteilung der Korrosionsbeständigkeit von empfindlichen metall¬haltigen Produkten, z. B. elektronischen Bauelementen, geeignet, die in Verkehrs- und Industrieumgebungen eingesetzt werden.

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 (ISO 21207:2015)

Ce document définit deux méthodes d’essai de corrosion accélérée à utiliser pour évaluer la résistance à la corrosion de produits contenant des métaux dans des environnements où les facteurs qui jouent un rôle significatif sont les ions chlorure, notamment sous forme de chlorure de sodium provenant d’une source marine ou des sels de déverglaçage des routes en hiver, et les gaz corrosifs résultant de la pollution industrielle ou de la circulation routière.
Ce document spécifie à la fois l’appareillage et les modes opératoires d’essai à utiliser pour exécuter les essais de corrosion accélérée.
Ces méthodes sont particulièrement appropriées à l’évaluation de la résistance à la corrosion des produits sensibles contenant des métaux, par exemple les composants électroniques, qui sont utilisés dans les environnements industriels et sur le réseau routier.

Korozijski preskusi v umetnih atmosferah - Pospešeni korozijski preskusi, ki vključujejo izmenično izpostavljenost plinom, ki spodbujajo korozijo, nevtralnemu razprševanju soli in sušenju (ISO 21207:2015)

General Information

Status
Published
Public Enquiry End Date
17-May-2022
Publication Date
11-Jul-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2022
Due Date
05-Sep-2022
Completion Date
12-Jul-2022

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SLOVENSKI STANDARD
SIST EN ISO 21207:2022
01-september-2022
Korozijski preskusi v umetnih atmosferah - Pospešeni korozijski preskusi, ki

vključujejo izmenično izpostavljenost plinom, ki spodbujajo korozijo, nevtralnemu

razprševanju soli in sušenju (ISO 21207:2015)

Corrosion tests in artificial atmospheres - Accelerated corrosion tests involving alternate

exposure to corrosion-promoting gases, neutral salt-spray and drying (ISO 21207:2015)

Korrosionsprüfungen in künstlichen Atmosphären - Beschleunigte Korrosionstests mit

alternativer Einwirkung von korrosionsfördernden Gasen, neutraler Salzsprühung und

Trocknung (ISO 21207:2015)

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

(ISO 21207:2015)
Ta slovenski standard je istoveten z: EN ISO 21207:2022
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 21207:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 21207:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 21207:2022
EN ISO 21207
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 77.060
English Version
Corrosion tests in artificial atmospheres - Accelerated
corrosion tests involving alternate exposure to corrosion-
promoting gases, neutral salt-spray and drying (ISO
21207:2015)

Essais de corrosion en atmosphères artificielles - Korrosionsprüfungen in künstlichen Atmosphären -

Essais de corrosion accélérée par expositions alternées Beschleunigte Korrosionstests mit alternativer

à des gaz oxydants ou au brouillard salin neutre et à un Einwirkung von korrosionsfördernden Gasen,

séchage (ISO 21207:2015) neutraler Salzsprühung und Trocknung (ISO
21207:2015)
This European Standard was approved by CEN on 20 June 2022.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21207:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 21207:2022
EN ISO 21207:2022 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 21207:2022
EN ISO 21207:2022 (E)
European foreword

The text of ISO 21207:2015 has been prepared by Technical Committee ISO/TC 156 "Corrosion of

metals and alloys” of the International Organization for Standardization (ISO) and has been taken over

as EN ISO 21207:2022 by 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 2022, and conflicting national standards

shall be withdrawn at the latest by December 2022.

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.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

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 21207:2015 has been approved by CEN as EN ISO 21207:2022 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 21207:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 21207:2022
INTERNATIONAL ISO
STANDARD 21207
Second edition
2015-12-15
Corrosion tests in artificial
atmospheres — Accelerated corrosion
tests involving alternate exposure to
corrosion-promoting 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
Reference number
ISO 21207:2015(E)
ISO 2015
---------------------- Page: 7 ----------------------
SIST EN ISO 21207:2022
ISO 21207:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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 2015 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 21207:2022
ISO 21207:2015(E)
Contents Page

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

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

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

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

3 Apparatus and reagents ................................................................................................................................................................................ 1

4 Evaluation of the corrosivity of the tests ..................................................................................................................................... 2

4.1 Reference test panels ......................................................................................................................................................................... 2

4.2 Arrangement of the reference panels during testing ............................................................................................. 3

4.3 Determination of mass loss after testing .......................................................................................................................... 3

4.4 Satisfactory performance of test .............................................................................................................................................. 3

5 Test objects ................................................................................................................................................................................................................. 4

6 Procedure..................................................................................................................................................................................................................... 4

6.1 Test method A .......................................................................................................................................................................................... 4

6.1.1 Test cycle ................................................................................................................................................................................. 4

6.1.2 Salt spray testing followed by drying (step a) ........................................................................................ 4

6.1.3 Exposure to corrosive gases followed by drying (step b) ............................................................. 5

6.1.4 Test duration ....................................................................................................................................................................... 5

6.2 Test method B .......................................................................................................................................................................................... 5

6.2.1 Test cycle ................................................................................................................................................................................. 5

6.2.2 Salt spray testing followed by drying (step a or step c) ................................................................. 6

6.2.3 Exposure to corrosive gases (step b or step d) ...................................................................................... 6

6.2.4 Test duration ....................................................................................................................................................................... 6

7 Evaluation of results ......................................................................................................................................................................................... 6

8 Test report ................................................................................................................................................................................................................... 7

Annex A (informative) Recommended test periods .............................................................................................................................. 8

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2015 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 21207:2022
ISO 21207:2015(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 WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 156, Corrosion of metals and alloys.

This second edition cancels and replaces the first edition (ISO 21207:2004), of which it constitutes a

minor revision. It also incorporates the Technical Corrigendum ISO 21207:2004/Cor 1:2008.

iv © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 21207:2022
ISO 21207:2015(E)
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 International Standard, 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 mass

fraction 5 % at 35 °C, followed by drying for 22 h in a standard laboratory climate;

b) exposure for 120 h in a test atmosphere containing a mixture of corrosion-promoting gases, volume

−6 −6

fraction of NO equal to 1,5 × 10 and of SO equal to 0,5 × 10 , at a relative humidity of 95 % and

2 2

at a temperature of 25 °C, followed by drying for 24 h in a standard laboratory climate.

Test method B 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 mass

fraction 5 % at 35 °C, followed by drying for 22 h in a standard laboratory climate;

b) exposure for 48 h in a test atmosphere containing a mixture of corrosion-promoting gases, volume

−6 −6

fraction of NO equal to 10 × 10 and of SO equal to 5 × 10 , at a relative humidity of 95 % and at

2 2
a temperature of 25 °C;

c) neutral salt spray testing (ISO 9227) for 2 h in a mist of a sodium chloride salt solution of mass

fraction 5 % at 35 °C, followed by drying for 22 h in a standard laboratory climate;

d) exposure for 72 h in a test atmosphere containing a mixture of corrosion-promoting gases, volume

−6 −6

fraction of NO equal to 10 × 10 and of SO equal to 5 × 10 , at a relative humidity of 95 % and at

2 2
a temperature of 25 °C.

The results obtained do not permit far-reaching conclusions on the corrosion resistance of the tested

product under the whole range of environmental conditions in which it may be used.

© ISO 2015 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 21207:2022
---------------------- Page: 12 ----------------------
SIST EN ISO 21207:2022
INTERNATIONAL STANDARD ISO 21207:2015(E)
Corrosion tests in artificial atmospheres — Accelerated
corrosion tests involving alternate exposure to corrosion-
promoting gases, neutral salt-spray and drying
1 Scope

This International Standard defines two accelerated corrosion test methods to be used in assessing the

corrosion resistance of products with metals in environments where there is a significant influence of

chloride ions, mainly as sodium chloride from a marine source or by winter road de-icing salt, and of

corrosion-promoting gases from industrial or traffic air pollution.

This International Standard specifies both the test apparatus and test procedures to be used in

executing the accelerated corrosion tests.

The methods are especially suitable for assessing the corrosion resistance of sensitive products with

metals, e.g. electronic components, used in traffic and industrial environments.
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 8407, Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 10062, Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es)

ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates —

Rating of test specimens and manufactured articles subjected to corrosion tests
3 Apparatus and reagents

3.1 Exposure of test objects to mixtures of NO and SO at a relative humidity of 95 % and a

2 2
temperature of 25 °C.

The climatic cabinet with inner chamber and gas flow system shall comply with the requirements

of ISO 10062.
The equipment used for testing shall be constructed for the following reasons.
a) The inner chamber and gas flow system consist of inert materials, e.g. PTFE

(polytetrafluoroethylene) or glass, to avoid or minimize adsorption of hostile gases on surfaces

other than of that of the test panels.

b) Airflow and hostile gas injection system are designed to ensure uniform test conditions in the inner

chamber or working space of cabinet.

In the most common design of test equipment, the test atmosphere in the working space is obtained

by continuously introducing the necessary quantity of the mixture of corrosion-promoting gases

into a damp airflow to obtain the required concentration. The corrosion-promoting gases and

conditioned air are mixed outside the cabinet. The conditioned air is taken from the outer chamber

of the climatic cabinet. The airflow after injection of the corrosion-promoting gases is then mixed

© ISO 2015 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 21207:2022
ISO 21207:2015(E)

with a flow of re-circulated test atmosphere and the resulting gas flow admitted into the inner

chamber or working space of the cabinet. Half of the flow of the test atmosphere through the inner

chamber may be re-circulated.

To ensure uniform test conditions in the working space, the test atmosphere is normally supplied

to the working space from the bottom and the outlet is placed at the top. Perforated plates are

placed in front of the openings to ensure uniform airflow through the working space.

c) Uniformity of temperature in the working space shall be better than ±1 °C and uniformity of relative

humidity better than ±3 %. In terms of corrosivity, expressed as the corrosion rate of copper

...

SLOVENSKI STANDARD
oSIST prEN ISO 21207:2022
01-april-2022
Korozijski preskusi v umetnih atmosferah - Pospešeni korozijski preskusi, ki

vključujejo izmenično izpostavljenost plinom, ki spodbujajo korozijo, nevtralnemu

razprševanju soli in sušenju (ISO 21207:2015)

Corrosion tests in artificial atmospheres - Accelerated corrosion tests involving alternate

exposure to corrosion-promoting gases, neutral salt-spray and drying (ISO 21207:2015)

Korrosionsprüfungen in künstlichen Atmosphären - Beschleunigte Korrosionstests mit

alternativer Einwirkung von korrosionsfördernden Gasen, neutraler Salzsprühung und

Trocknung (ISO 21207:2015)

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

(ISO 21207:2015)
Ta slovenski standard je istoveten z: prEN ISO 21207
ICS:
77.060 Korozija kovin Corrosion of metals
oSIST prEN ISO 21207:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 21207:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 21207:2022
INTERNATIONAL ISO
STANDARD 21207
Second edition
2015-12-15
Corrosion tests in artificial
atmospheres — Accelerated corrosion
tests involving alternate exposure to
corrosion-promoting 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
Reference number
ISO 21207:2015(E)
ISO 2015
---------------------- Page: 3 ----------------------
oSIST prEN ISO 21207:2022
ISO 21207:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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 2015 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 21207:2022
ISO 21207:2015(E)
Contents Page

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

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

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

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

3 Apparatus and reagents ................................................................................................................................................................................ 1

4 Evaluation of the corrosivity of the tests ..................................................................................................................................... 2

4.1 Reference test panels ......................................................................................................................................................................... 2

4.2 Arrangement of the reference panels during testing ............................................................................................. 3

4.3 Determination of mass loss after testing .......................................................................................................................... 3

4.4 Satisfactory performance of test .............................................................................................................................................. 3

5 Test objects ................................................................................................................................................................................................................. 4

6 Procedure..................................................................................................................................................................................................................... 4

6.1 Test method A .......................................................................................................................................................................................... 4

6.1.1 Test cycle ................................................................................................................................................................................. 4

6.1.2 Salt spray testing followed by drying (step a) ........................................................................................ 4

6.1.3 Exposure to corrosive gases followed by drying (step b) ............................................................. 5

6.1.4 Test duration ....................................................................................................................................................................... 5

6.2 Test method B .......................................................................................................................................................................................... 5

6.2.1 Test cycle ................................................................................................................................................................................. 5

6.2.2 Salt spray testing followed by drying (step a or step c) ................................................................. 6

6.2.3 Exposure to corrosive gases (step b or step d) ...................................................................................... 6

6.2.4 Test duration ....................................................................................................................................................................... 6

7 Evaluation of results ......................................................................................................................................................................................... 6

8 Test report ................................................................................................................................................................................................................... 7

Annex A (informative) Recommended test periods .............................................................................................................................. 8

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2015 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 21207:2022
ISO 21207:2015(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 WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 156, Corrosion of metals and alloys.

This second edition cancels and replaces the first edition (ISO 21207:2004), of which it constitutes a

minor revision. It also incorporates the Technical Corrigendum ISO 21207:2004/Cor 1:2008.

iv © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 21207:2022
ISO 21207:2015(E)
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 International Standard, 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 mass

fraction 5 % at 35 °C, followed by drying for 22 h in a standard laboratory climate;

b) exposure for 120 h in a test atmosphere containing a mixture of corrosion-promoting gases, volume

−6 −6

fraction of NO equal to 1,5 × 10 and of SO equal to 0,5 × 10 , at a relative humidity of 95 % and

2 2

at a temperature of 25 °C, followed by drying for 24 h in a standard laboratory climate.

Test method B 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 mass

fraction 5 % at 35 °C, followed by drying for 22 h in a standard laboratory climate;

b) exposure for 48 h in a test atmosphere containing a mixture of corrosion-promoting gases, volume

−6 −6

fraction of NO equal to 10 × 10 and of SO equal to 5 × 10 , at a relative humidity of 95 % and at

2 2
a temperature of 25 °C;

c) neutral salt spray testing (ISO 9227) for 2 h in a mist of a sodium chloride salt solution of mass

fraction 5 % at 35 °C, followed by drying for 22 h in a standard laboratory climate;

d) exposure for 72 h in a test atmosphere containing a mixture of corrosion-promoting gases, volume

−6 −6

fraction of NO equal to 10 × 10 and of SO equal to 5 × 10 , at a relative humidity of 95 % and at

2 2
a temperature of 25 °C.

The results obtained do not permit far-reaching conclusions on the corrosion resistance of the tested

product under the whole range of environmental conditions in which it may be used.

© ISO 2015 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 21207:2022
---------------------- Page: 8 ----------------------
oSIST prEN ISO 21207:2022
INTERNATIONAL STANDARD ISO 21207:2015(E)
Corrosion tests in artificial atmospheres — Accelerated
corrosion tests involving alternate exposure to corrosion-
promoting gases, neutral salt-spray and drying
1 Scope

This International Standard defines two accelerated corrosion test methods to be used in assessing the

corrosion resistance of products with metals in environments where there is a significant influence of

chloride ions, mainly as sodium chloride from a marine source or by winter road de-icing salt, and of

corrosion-promoting gases from industrial or traffic air pollution.

This International Standard specifies both the test apparatus and test procedures to be used in

executing the accelerated corrosion tests.

The methods are especially suitable for assessing the corrosion resistance of sensitive products with

metals, e.g. electronic components, used in traffic and industrial environments.
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 8407, Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 10062, Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es)

ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates —

Rating of test specimens and manufactured articles subjected to corrosion tests
3 Apparatus and reagents

3.1 Exposure of test objects to mixtures of NO and SO at a relative humidity of 95 % and a

2 2
temperature of 25 °C.

The climatic cabinet with inner chamber and gas flow system shall comply with the requirements

of ISO 10062.
The equipment used for testing shall be constructed for the following reasons.
a) The inner chamber and gas flow system consist of inert materials, e.g. PTFE

(polytetrafluoroethylene) or glass, to avoid or minimize adsorption of hostile gases on surfaces

other than of that of the test panels.

b) Airflow and hostile gas injection system are designed to ensure uniform test conditions in the inner

chamber or working space of cabinet.

In the most common design of test equipment, the test atmosphere in the working space is obtained

by continuously introducing the necessary quantity of the mixture of corrosion-promoting gases

into a damp airflow to obtain the required concentration. The corrosion-promoting gases and

conditioned air are mixed outside the cabinet. The conditioned air is taken from the outer chamber

of the climatic cabinet. The airflow after injection of the corrosion-promoting gases is then mixed

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oSIST prEN ISO 21207:2022
ISO 21207:2015(E)

with a flow of re-circulated test atmosphere and the resulting gas flow admitted into the inner

chamber or working space of the cabinet. Half of the flow of the test atmosphere through the inner

chamber may be re-circulated.

To ensure uniform test conditions in the working space, the test atmosphere is normally supplied

to the working space from the bottom and the outlet is placed at the top. Perforated plates are

placed in front of the openings to ensure uniform airflow through the working space.

c) Uniformity of temperature in the working space shall be better than ±1 °C and uniformity of relative

humidity better than ±3 %. In terms of corrosivity, expressed as the corrosion rate of copper metal,

the uniformity shall be not less than 5 %.

NOTE The uniformity of the test conditions in the working space may be checked regularly by exposing

a number of copper metal coupons, placed at different positions in the working space during testing. The

differences in weight change of the metal coupons indicate if the uniformity of test conditions is within the

specified range.

d) The tolerance of the damp air flow shall be within ±1 °C of the specified temperature and the

tolerance on relative humidity ±3 %. The linear flow rate of air shall be in the range of 0,5 mm/s to

5 mm/s. The damp airflow shall be free of water droplets or aerosols.

In the most common design of test equipment, the air is introduced to the outer chamber of the

cabinet after filtration and purification by activated charcoal and a particulate filter. The nitrogen

dioxide and the sulfur dioxide gases may be taken either from pressurized cylinders filled with a

volume fraction of 0,001 % high-purity gases with a volume fraction of 1 000 × 10 in high-purity

nitrogen gas or from thermostat-controlled permeation tubes.

e) For exposure of test panels in the working space, specimen holders shall be used so that the test

panels do not shield one another or disturb the uniformity of airflow across the chamber.

f) The temperature, relative humidity, and concentration of sulfur dioxide and nitrogen dioxide in the

airflow at the outlet of working space shall be monitored so that they reflect the true test conditions

for the test objects.
3.2 Salt spray testing in accordance with ISO 9227.

The apparatus and reagents to be used shall comply with the requirements of ISO 9227.

3.3 Drying in standard laboratory climate.

For the test, a room with an appropriate system for control of its temperature at 23 °C ± 2 °C and its

relative air humidity at 50 % ± 5 % shall be used.
4 Evaluation of the corrosivity of the tests
4.1 Reference test panels

For measurement of the corrosivity of the tests in accordance with this International Standard, four

reference panels of metallic copper (minimum 99,85 % mass fraction of Cu) shall be used.

The reference specimens shall have dimensions of 50 mm × 50 mm × 1 mm.
Prior to
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