Electrodeposition of chromium and its alloys

Details Electrodeposition of chromium and its alloys Electrodeposition of chromium and its alloys

C - Chemistry, Metallurgy

25

D

204/35

C25D 3/06 (2006.01) C25D 3/56 (2006.01)

Patent

CA 1209089

ELECTRODEPOSITION OF CHROMIUM AND ITS ALLOYS Abstract A chromium electroplating electrolyte containing a source of trivalent chormium ions, a complexant, a buffer agent and a sulphur species having S-O or S-S bonds for promoting chromium deposition, the complexant being selected so that the stability constant K1 of the chromium complex as defined herein is in the range 106 < K1 < 1012 M-1 and the sulphur species being selected from thiosulphates, thionates, polythionates and sulfoxylates. Complexants within this range include aspartic acid, iminodiacetic acid, nitrilotriacetic acid, 5-sulphosalicylic acid or citric acid.

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