ISO 3613:2021
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Metallic and other inorganic coatings Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc-aluminium alloys Test methods
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10-05-2021
This document specifies methods for the determination of
the presence of colourless chromate conversion coatings,
the presence of hexavalent chromium in colourless and coloured coatings on zinc or cadmium or aluminium-zinc (mass fraction of aluminium: 55%, within a range of 54% to 56% mass fraction) and zinc-aluminium (mass fraction of aluminium: 5%) alloys,
the total chromium content per unit area on zinc and cadmium,
the mass per unit area of both colourless and coloured coatings,
the satisfactory adhesion of chromate conversion coatings, and
the quality of chromate coatings.
These methods are applicable to
colourless and coloured chromate conversion coatings containing trivalent and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes, and
chromate coatings that are free from any supplementary coatings, such as oil, water or solvent-based polymers or wax.
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