introduction
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ISO 11997-3-2020 – Determination of resistance of paints and varnishes to cyclic corrosion environments – Part 3: Testing of coating systems for automotive structural materials and components

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This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, Common Test Methods for paints and varnishes.

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introduce

This document is based on SEP 1850[9] and VDA 233-102[10].

ISO 11997-3-2020 – Determination of resistance of paints and varnishes to cyclic corrosion environments – Part 3: Testing of coating systems for automotive structural materials and components

1 Range
This document specifies a cyclic corrosion test based method for testing corrosion protection in vehicles using coating systems that use aluminum, steel, or galvanized steel.

The test method uses corrosive conditions (temperature and humidity slopes and salt spray) to create realistic corrosion patterns. These corrosion patterns are typical of cars, and in the case of sufficiently similar protective coating systems, they are comparable. In particular, the accelerated test examined delamination/corrosion creep caused by man-made damage to defined coatings. Also included are surface and edge corrosion studies or investigations of adhesive samples or assemblies. This cyclic corrosion test is also suitable for testing corrosion in the flange area or near the clearance.

This document has been developed for the evaluation of coated substrates (samples, body and mounting parts) in the automotive industry. Other applications, such as components with unpainted metal coatings, fall outside the scope of standardization efforts. This document was originally developed for coating systems on aluminum, steel, or galvanized steel, but can also be used to evaluate the corrosion resistance of coating systems on other metals and their alloys.

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 11997-3-2020 – Determination of resistance of paints and varnishes to cyclic corrosion environments – Part 3: Testing of coating systems for automotive structural materials and components

ISO 2409, Paints and varnishes – Crosscutting testing

ISO 3574, commercial and tensile quality cold reduced carbon steel plates

ISO 4618, paints and varnishes – Terms and definitions

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

ISO 4628-2, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 2: Assessment of degree of foaming

ISO 4628-3, Paints and varnishes – Assessment of degradation of coatings – number and size of defects and assignment of intensity of uniform change in appearance – Part 3: Assessment of degree of rust

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

ISO 4628-5, Paints and varnishes – Assessment of degradation of coatings – Number and size of defects and designation of intensity of uniform change in appearance – Part 5: Assessment of degree of peeling

ISO 4628-8, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 8: Assessment of delamination and degree of corrosion around lines or other artificial defects

ISO 4628-10, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 10: Assessment of degree of filamentous corrosion

ISO 11997-3-2020 – Determination of resistance of paints and varnishes to cyclic corrosion environments – Part 3: Testing of coating systems for automotive structural materials and components

ISO 9227:2017, corrosion tests in artificial atmospheres – salt spray tests

ISO 17872, Paints and varnishes – Guidelines for the introduction of scribbling marks through coatings on metal panels for corrosion testing

ISO 20567-1, Paints and varnishes – Determination of the resistance of coatings to stone chips – Part 1: multiple impact test

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