scope:

This International Standard specifies methods for the determination of the presence of colourless chromate conversion coatings; total and quantity of hexavalent chromium in colourless and coloured coatings on zinc, cadmium, aluminium (55 % mass fraction within a range of 54 % to 56 % 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 coatings. These methods are applicable to colourless and coloured chromate conversion coatings containing tri- and hexa- valent chromium in varying proportions and produced by either chemical or electrochemical processes; only to chromate coatings that are free from any supplementary coatings such as oil, water or solvent-based polymers or wax