Method of purifying trivalent chromium electroplating baths

Details Method of purifying trivalent chromium electroplating baths Method of purifying trivalent chromium electroplating baths

C - Chemistry, Metallurgy

25

D

204/35

C25D 21/18 (2006.01)

Patent

CA 1213558

ABSTRACT OF THE DISCLOSURE A method for purifying trivalent chromium electrolytes containing deleterious contaminating metal ions in concentrations which detrimentally affect the performance of the electrolyte producing chromium deposits which are commercially unsatisfactory due to the presence of dark streaky or spongy deposits. In accordance with the method disclosed, a selective precipitation of such detrimental metal ions includ- ing iron, copper, nickel, zinc and lead ions is selectively and effectively achieved by the addition of controlled effective amounts of bath soluble and compatible dimethyldithiocarbamate and diethyldithio- carbamate ions and mixtures thereof and the resultant precipitate is thereafter removed such as by filtra- tion.

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