Electrodeposition bath including chromic acid, sulphate,...

Details Electrodeposition bath including chromic acid, sulphate,... Electrodeposition bath including chromic acid, sulphate,...

C - Chemistry, Metallurgy

25

D

204/35

C25D 3/04 (2006.01)

Patent

CA 1135655

Abstract of the Disclosure A wear-resistant article comprises a zinc base metal having a sub- stantially continuous, hard chromium skin layer on at least one surface thereof and a chromium-enriched subsurface layer of the zinc base metal situated im- mediately below the chromium skin layer. The chromium-enriched subsurface layer has a gradually decreasing chromium content in a direction inwardly away from the skin layer and is at least as thick as the skin layer. The wear-re- sistant article of this invention is produced by direct electrodeposition of chromium onto the zinc base metal from a self-regulating bath under controlled conditions. The chrome plating solution includes chromic acid, sulphite ions, alkaline fluosilicate, boric acid and alkali metal carbonate.

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