Process for electrolytically coloring aluminum and aluminum...

Details Process for electrolytically coloring aluminum and aluminum... Process for electrolytically coloring aluminum and aluminum...

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/14 (2006.01) C25D 11/22 (2006.01)

Patent

CA 1075189

ABSTRACT OF THE DISCLOSURE A process is described for electrolytically coloring aluminum or an aluminum alloy in a gold color. Aluminum or an aluminum alloy is first anodized to form an oxide film thereon. The anodized basis metal is electrolyzed by use of alternating current in an electrolytic solution which is prepared by adding formaldehyde, usually formalin, and thiosul- fate to an acid solution of stannous sulfate. The acid solu- tion of stannous sulfate can be prepared by dissolving stannous sulfate in an aqueous solution of sulfuric acid, sulfamic acid, tartaric acid or the like.

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