ISO 3613:2021 PDF

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.