Trivalent chromium electroplating solution and including...

C - Chemistry – Metallurgy – 25 – D

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C25D 3/06 (2006.01) C25D 3/10 (2006.01)

Patent

CA 1195646

ABSTRACT TRIVALENT CHROMIUM ELECTROPLATING SOLUTION INCLUDING THIOCYANATE AND ALKALI METAL SULPHATES A chromium electroplating solution in which the source of chromium comprises an equilibrated aqueous solution of chromium (III) - thiocyanate complexes and which has a supporting electrolyte consisting essentially of potassium sulphate or, preferably, a mixture of potassium and sodium sulphates. Such a solution is employed as the catholyte in a plating bath in which catholyte and anolyte are separated by a cation exchange membrane. This all sulphate bath permits the employment of lead anodes and has high efficiency and a good plating range.

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