Treatment of galvanized steel

Details Treatment of galvanized steel Treatment of galvanized steel

C - Chemistry, Metallurgy

25

D

148/20, 204/35

C25D 11/38 (2006.01)

Patent

CA 1311714

ABSTRACT OF THE DISCLOSURE A method of treating a zinc plated steel surface provides improved corrosion resistance and painting properties. The surface is rendered cathodic in the presence of an aqueous treatment liquor containing 5 - 70 g/l of hexavalent chromium, 0.01 to 5 g/l of trivalent chromium, 5 - 100 g/l of silica and/or silicate and 0.05 - 10 g/l of nitrate in which the ratio of Cr3+/Cr6+ is within the range 1/50 - 1/3.

521583

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