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 3/04 (2006.01) C25D 3/06 (2006.01) C25D 3/56 (2006.01)

Patent

CA 1210733

ELECTRODEPOSITION OF CHROMIUM AND ITS ALLOYS Abstract A chromium electroplating electrolyte comprising a source of trivalent chromium ions, a complexant, a buffer agent and a sulphur species selected from sulphites and dithionites, 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 preferably the chromium ions have a molar concentration lower than 0.01M. Complexants within this range include aspartic acid, iminodiacetie acid, nitrilotriacetic acid, 5-sulphosalicylic acid and citric acid.

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