Treatment of chromium electrodeposit

Details Treatment of chromium electrodeposit Treatment of chromium electrodeposit

C - Chemistry, Metallurgy

25

D

204/21

C25D 5/48 (2006.01) C23C 22/68 (2006.01)

Patent

CA 1116119

ABSTRACT OF THE DISCLOSURE A method whereby a surface of chromium metal electro- deposited on a zinc substrate from a trivalent chromium electro- lyte is treated by contacting the surface with an aqueous solution at a pH of from 5 to 12 and containing a dissolved metal salt of a weak acid which does not form a soluble complex with zinc. Preferred salts are carbonates, phosphates and silicates of an alkali metal, e.g. sodium or potassium. Also disclosed is the product of said process comprising an article having a zinc substrate, a microporous electrodeposited chromium coating from 0.025 to 2.5 microns in thickness on said substrate, and a water-insoluble basic salt of zinc within the micropores.

296628

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