Paints and varnishes. Evaluation of degradation of coatings. Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Assessment of degree of delamination and corrosion around a scribe or other artificial…

Paints and varnishes. Evaluation of degradation of coatings. Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Assessment of degree of delamination and corrosion around a scribe or other artificial…

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1   Scope

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,[7] and sea water immersion as used in the test method specified in ISO 15711.[8] 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;[2]
  • — rusting in accordance with ISO 4628-3;[3]
  • — cracking in accordance with ISO 4628-4;[4]
  • — flaking in accordance with ISO 4628-5;[5]
  • — filiform corrosion in accordance with ISO 4628-10.[6]