International Organization for Standardization

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 - Second Edition
 N 4628-8

Annotation

This part of ISO 4628 specifies a method for assessing delamination and corrosion around a scribe or other artificial defect on a coated panel or other coated test specimen, caused by a corrosive environment.

This part of ISO 4628 does not cover evaluation of pitting corrosion or pit depth.

NOTE 1 Examples of corrosive environments are artificial atmospheres such as salt spray, as used in the test method specified in ISO 9227,and sea water immersion as used in the test method specified in ISO 15711. Natural environments can also be used.

NOTE 2 The extent of other defects can also be determined at the same time as delamination and corrosion. Methods are given as follows:

— blistering in accordance with ISO 4628-2;

— rusting in accordance with ISO 4628-3;

— cracking in accordance with ISO 4628-4;

— flaking in accordance with ISO 4628-5;

— filiform corrosion in accordance with ISO 4628-10.

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