A Preface
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This document is prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General Test methods for paints and varnishes.

ISO 11997-1-2017 – Determination of cyclic corrosion resistance of paints and varnishs-Part 1: Wet (salt spray)/ dry/wet

The third edition cancels and replaces the second edition of the technical revision (ISO 11997-1:2005).

Compared with the previous edition, the main changes are as follows:

– The time when no moisture can be seen on the panel (see 6.4) has been changed;

– Added reference to ISO 4628-8 for assessing the degree of delamination and corrosion around markings or other man-made defects;

– Added reference to ISO 4620-10 for assessing the degree of filamentous corrosion;

— Supplementary test conditions previously listed in Annex A have been incorporated into the test report;

— The number and order of attachments have been changed;

– The pH adjustment procedures for salt solutions in Appendices A to D have been implemented since ISO 9227;

– Where possible, the text has been aligned with the new version of ISO 9227.

A list of all parts in the ISO 11997 series can be found on the ISO website.

ISO 11997-1-2017 – Determination of cyclic corrosion resistance of paints and varnishs-Part 1: Wet (salt spray)/ dry/wet

Introduction
Paints, varices and coatings of similar materials are exposed to one of the four cycles of wet and dry conditions specified in this document (see Annex A of Annex D) using the specified salt solution in the cabinet in order to simulate in the laboratory the processes that occur under corrosive outdoor conditions, such as Marine environments. In general, a correlation between such outdoor aging and laboratory tests cannot be expected due to the large number of factors affecting the breakdown process. Correlations can only be expected if the effects of important parameters, such as the nature of the contaminant, the spectral distribution of incident irradiance in the relevant photochemical region, the temperature of the specimen, the type and period of wetting, and the relative humidity, on the coating are known. Compared to outdoor aging, the number of variables that can be controlled is smaller when laboratory testing is performed in a cabinet, so the effect is more reproducible. The described method can also provide a means of checking whether the quality of the paint or paint system is maintained.

It has been found that this method can be used to compare the cyclic salt spray tolerance of different coatings. It is most applicable to provide relevant ratings for a range of coated panels that exhibit significant differences in cyclic salt spray resistance.

The test cycles included in this document have been successfully used in the industry for performance evaluation with documented evidence. The cycle can be summarized as follows.

— Cycle A (see Annex A) : This cycle is specified in the Japanese automotive standards JASO M 609-91 and JASO M610-92.

— Cycle B (see Annex B) : This is based on the VDA 621-415 cycle, which is widely used in Europe. It has also been shown to correlate well with the natural weathering of thermoset coatings in vehicle corrosion.

-Cycle C (see Annex C) : This cycle was developed in the UK for use in water-soluble and latex paint systems and has been shown to correlate well with natural weathering.

— Cycle D (see Annex D) : This cycle is specified in the Japanese standard JIS K 5621-2003.

Additional loops are intended to be added in subsequent revisions of this document, as they were developed for the evaluation of other paint types.

ISO 11997-2 describes a method for determining paint cycle corrosion resistance that includes UV exposure as part of the cycle. It has been found to have a good correlation with the natural weathering of industrial maintenance coatings.

ISO 11997-1-2017 – Determination of cyclic corrosion resistance of paints and varnishs-Part 1: Wet (salt spray)/ dry/wet

1 Scope
This document specifies a method for determining the tolerance of a coating to one of the four defined cycles of wet (salt spray)/dry/wet conditions using a specified solution.

2 Normative references
The following documents are referenced in the text in such a way that some or all of their contents constitute the requirements of this document. For dated references, only the cited version applies. For undated references, the new version of the reference (including any revisions) applies.

ISO 1513, Paints and varnishes – Examination and preparation of test samples

ISO 1514, Paints and varnishes — Test standard panel

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 3270, Paints and varnishes and their raw materials – temperature and humidity regulated and tested

ISO 3696, analytical laboratory water use – specifications and test methods

ISO 4628-1, Paints and varnishes — Assessment of degradation of coatings — number and size of defects and designation of intensity of uniform changes in appearance — Part 1: General introduction and designation system

ISO 4628-2, Paints and varnishes — Assessment of degradation of coatings — Designation of the number and size of defects and the intensity of uniform changes in appearance — Part 2: Assessment of the degree of foaming

ISO 4628-3, Paints and varnishes — Assessment of degradation of coatings — Designation of the number and size of defects and the intensity of uniform changes in appearance — Part 3: Assessment of the degree of rust

ISO 4628-4, Paints and varnishes – Assessment of degradation of coatings – Specification of the number and size of defects and the intensity of uniform changes in appearance – Part 4: Assessment of the degree of cracking

ISO 4628-5, Paints and varnishes — Assessment of coating degradation — Designation of the number and size of defects and the intensity of uniform changes in appearance — Part 5: Assessment of the degree of peeling

ISO 4628-8, Paints and varnishes — Assessment of degradation of coatings — Designation of the number and size of defects, and the intensity of uniform changes in appearance — Part 8: Assessment of the degree of delimitation and corrosion around markings or other artificial defects

ISO 4628-10, Paints and varnishes — Assessment of degradation of coatings — Specification of the number and size of defects and the intensity of uniform changes in appearance — Part 10: Assessment of the degree of filamentous corrosion

ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

ISO 17872-2007, Paints and varnishes. Guidelines for corrosion testing by introducing scribing marks through metal panel coatings

ISO 11997-1-2017 – Determination of cyclic corrosion resistance of paints and varnishs-Part 1: Wet (salt spray)/ dry/wet

3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminology databases for standardization at the following addresses:

– IEC Electronic Encyclopedia: available at electropedia.org/

– ISO online browsing platform: available at iso.org/obp

Only the standard information component is publicly available. To see the full content, you’ll need to purchase the standards through formal channels.