NEN-EN-ISO 3613
Metallic and other inorganic coatings - Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc-aluminium alloys - Test methods
| Organization: | NEN |
| Publication Date: | 1 June 2021 |
| Status: | active |
| Page Count: | 26 |
| ICS Code (Surface treatment): | 25.220.20 |
scope:
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 solventbased polymers or wax.
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