C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/35
C25D 3/06 (2006.01) C25D 21/18 (2006.01)
Patent
CA 1215671
ABSTRACT OF THE DISCLOSURE An improved aqueous acidic trivalent chro- mium electrolyte and process for increasing the toler- ance of such electrolytes to the presence of deleteri- ous contaminating metal ions which normally progres- sively increase during commercial operation of the electrolyte ultimately resulting in chromium electro- deposits which are commercially unsatisfactory due to the presence of streaks, clouds and hazes in the de- posit. The improved composition contains controlled effective amounts of thiazole or benzothiazole com- pounds which are effective to mask the adverse effects of such contaminating metal impurities and which also enhance the codeposition of such metal contaminants on the parts being plated thereby reducing, and in some instances preventing the progressive accumulation of such contaminating metal ions in the electrolyte. The invention further encompasses the process of reju- venating trivalent chromium electrolytes which have been rendered deficient in their ability to deposit satisfactory chromium platings by a controlled addition of such additive agents followed by electrolyzing of the electrolyte to progressively reduce the concentra- tion of contaminating metal ions to a level in which satisfactory performance of the electrolyte is restored.
432828
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Omi International Corporation
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