ISO 11997-3:2022

INTERNATIONAL ISO
STANDARD 11997-3
First edition
2022-07
Paints and varnishes — Determination
of resistance to cyclic corrosion
conditions —
Part 3:
Testing of coating systems on
materials and components in
automotive construction
Peintures et vernis — Détermination de la résistance aux conditions
cycliques de corrosion —
Partie 3: Essais de systèmes de revêtements sur matériaux et
composants en construction automobile
Reference number
© ISO 2022
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 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Apparatus and test equipment . 2
6 Test specimen preparation . 4
7 Procedure .4
7.1 Test conditions – Test procedure . 4
7.2 Interruption of the test . 7
7.3 Positioning of test specimens in the chamber . 7
8 Method for evaluating chamber corrosivity . 8
9 Ev a luat ion . 8
10 Precision . 8
11 Test report . 9
Annex A (informative) Preparation and post-treatment of the mass-loss coupons.10
Annex B (normative) Climate data settings of the daily cycles .11
Annex C (informative) Sample of specified data for the programming of climate data .14
Annex D (informative) Details of interlaboratory testing .15
Annex E (informative) Additional information on the test specimen .22
Bibliography .23
iii
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 35, Paints and varnishes, Subcommittee
SC 9, General test methods for paints and varnishes.
A list of all parts in the ISO 11997 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
Introduction
[9] [10]
This document was prepared on the basis of SEP 1850 and VDA 233-102 .
v
INTERNATIONAL STANDARD ISO 11997-3:2022(E)
Paints and varnishes — Determination of resistance to
cyclic corrosion conditions —
Part 3:
Testing of coating systems on materials and components in
automotive construction
1 Scope
This document specifies a method based on a cyclic corrosion test for testing the corrosion protection
of automobiles using coating systems on aluminium, steel or galvanized steel.
The test method uses corrosive conditions (temperature and humidity ramps and salt spray) to
create realistic corrosion patterns. These corrosion patterns are typical for automobiles, and they are
comparable in the case of sufficiently similar protective coating systems. In particular, the accelerated
test investigates the delamination/corrosion creep that results from defined artificial damage to
a coating. Investigations of surface and edge corrosion or investigations of adhesive specimens or
components are also covered. This cyclic corrosion test is also suitable for testing corrosion in flanged
areas or near gaps.
This document was developed for the assessment of coated substrates (test specimens, bodywork and
mounted parts) in the automotive industry. Other applications, such as components with unpainted
metallic coatings, were not part of the scope of the standardization work. This document was originally
developed for coating systems on aluminium, steel or galvanized steel but it can also be used for the
assessment of the corrosion resistance of coating systems on other metals and their alloys.
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 2409, Paints and varnishes — Cross-cut test
ISO 3574, Cold-reduced carbon steel sheet of commercial and drawing qualities
ISO 4618, Paints and varnishes — Terms and definitions
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 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 4628-8, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 8: Assessment of degree of
delamination and corrosion around a scribe or other artificial defect
ISO 4628-10, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 10: Assessment of degree of
filiform corrosion
ISO 9227:2017, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 17872, Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on
metallic panels for corrosion testing
ISO 20567-1, Paints and varnishes — Determination of stone-chip resistance of coatings — Part 1: Multi-
impact testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
WARNING — This document may involve hazardous materials, operations and equipment. This
document does not purport to address all of the safety concerns, if any, associated with its use.
It is the responsibility of the user of this document to establish appropriate safety and health
practices and determine the applicability of regulatory limitations prior to use.
The test specimens are tested in a cyclic test that involves salt spray, humidity ramps and temperature
ramps. In this way, realistic corrosion patterns are created for coated substrates of steel, galvanized
steel and aluminium. The results of the tests are assessed based on subjective criteria that are agreed
beforehand between the contractual partners.
5 Apparatus and test equipment
The typical laboratory and glass or plastics apparatus, together with the following.
5.1 Corrosion test chamber
All parts of the test chamber that come into contact with salt spray, condensate or test solutions shall
be made of a material that is resistant to attack by the test solutions and does not itself affect the action
of the test solutions or the salt spray/condensate on the test specimens.
The test may be carried out in separate chambers as long as the climatic conditions for the cycles are
met. Chambers that can perform all conditions are available and recommended.
Test chambers shall consist of a cooling unit, heating, pressure equalization as well as the necessary
measurement and control equipment to set and maintain the climate data described in Annex B
(temperature ±2 °C, relative humidity ±5 %) as measured at a reference point in the closed chamber
at defined temperature/relative humidity values. When passing through temperature ramps in phases
with constant relative humidity, deviations in relative humidity of −8 % to +5 % are permitted.
The test chamber shall be designed in such a way that no drops fall from the ceiling or side walls onto
the test specimens positioned below them. A test solution that has already been sprayed shall not be
returned to the storage container.
The usable space f
...