ISO 3613:2021

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.