C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/122, 204/35
C25D 3/06 (2006.01) C25D 17/10 (2006.01)
Patent
CA 1120427
ABSTRACT OF THE DISCLOSURE This specification relates to the electroplating of metals and in particular to an electroplating bath having an acolyte separated from the catholyte by a cation exchange membrane. This specification provides an electroplating bath having an anolyte separated from a catholyte by a perfluorinated cation exchange membrane. One use of the present invention is in trivalent chromium plating solutions wherein oxidation of Cr(III) ions to Cr(VI) occurs at the anode and accumulation of Cr(VI) ions in the plating solution ultimately results in the cessation of plating. The use of perfluorinated cation exchange membranes prevents this anode reaction, with negligible increase in the plating voltage. The anolyte preferably has a depolarising species therein capable of reducing the electrode potential of the anode when the bath is in use. In addition the pH of the catholyte can be stabilised by arranging the pH of the anolyte to allow hydrogen transport through the membrane to compensate for hydrogen evolution at the cathode.
324906
Barclay Donald J.
Vigar James M.
Gowling Lafleur Henderson Llp
International Business Machines Corporation
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