BS EN 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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English
06-03-2021
This document specifies methods for the determination of
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the presence of colourless chromate conversion coatings,
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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,
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the total chromium content per unit area on zinc and cadmium,
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the mass per unit area of both colourless and coloured coatings,
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the satisfactory adhesion of chromate conversion coatings, and
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the quality of chromate coatings.
These methods are applicable to
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colourless and coloured chromate conversion coatings containing trivalent and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes, and
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chromate coatings that are free from any supplementary coatings, such as oil, water or solvent-based polymers or wax.
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