scope:

Specifies methods for the determination of the - presence of colourless chromate conversion coatings; - presence and quantity of hexavalent chromium in colourless and coloured coatings on zinc, cadmium, aluminium (55% mass fraction)-zinc and zinc-aluminium (5% mass fraction) alloys; - total chromium content per unit area on zinc and cadmium; - mass per unit area of both colourless and coloured coatings; - satisfactory adhesion of chromate conversion coatings; - quality of chromate coating. These methods are applicable - to colourless and coloured chromate conversion coatings containing tri- and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes; - only to chromate coatings that are free any supplementary coatings such as oil, water or solvent-based polymers or wax.