Rejuvenation of trivalent chromium electrolyte

Details Rejuvenation of trivalent chromium electrolyte Rejuvenation of trivalent chromium electrolyte

C - Chemistry, Metallurgy

25

D

204/35

C25D 21/18 (2006.01) C25D 3/06 (2006.01)

Patent

CA 1201411

ABSTRACT The invention is concerned with a process for rejuvenating an aqueous acidic trivalent chromium electrolyte which has been impaired in effectiveness due to the contamination by excessive quantities of hexavalent chromium, the electrolyte containing triva- lent chromium ions, a complexing agent for maintaining the trivalent chromium ions in solution, halide ions, ammonium ions and hydrogen ions to provide a pH on the acid side. The process of the invention comprises the step of adding to the electrolyte a reducing agent comprising vanadium ions in at least an amount sufficient to reduce the concentration of hexavalent chromium ions to a level which is not in excess of 0.4 grams/liter. The invention enables one to restore the plating efficiency and throwing power of a chromium electro- plating bath while avoiding the costly and time consum- ing step of dumping and replacing the electrolyte.

467415

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