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Paint and Coatings Industry Standards
ISO 10309:1994 Metallic coatings -- Porosity tests -- Ferroxyl test
Lays down a method of revealing pores or other discontinuities, when testing metallic coatings, that are not visibly affected by ferricyanide and chloride ions during the test period and that are cathodic to iron and steel. This method is especially useful for thick, hard chromium coatings used for wear resistance.
