Full Description

This International Standard specifies methods for the determination of the

presence of colourless¹⁾ chromate conversion coatings;presence and quantity of hexavalent chromium in colourless and coloured coatings on zinc, cadmium, aluminium (55 % mass fraction)-zinc and zinc-aluminium (5 % mass fraction) alloys;total chromium content per unit area on zinc and cadmium;mass per unit area of both colourless and coloured coatings;satisfactory adhesion of chromate conversion coatings;quality of chromate coating.

These methods are applicable

to colourless and coloured chromate conversion coatings containing tri- and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes;only to chromate coatings that are free from any supplementary coatings such as oil, water or solvent-based polymers or wax.

1) The application of very thin, colourless, practically invisible chromate conversion coatings is frequently called passivation, while the application of thicker, coloured chromate conversion coatings is often called chromating. The term passivation is not correct and is, therefore, not recommended.

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Published: 06/15/2000 Number of Pages: 7 File Size: 1 file , 62 KB