Trivalent chromium electroplating baths and electroplating there

Details Trivalent chromium electroplating baths and electroplating there Trivalent chromium electroplating baths and electroplating there

1977-08-26

1978-08-29

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 43R, 204 51, C25D 306, C25D 356

Patent

active

RE0297496

ABSTRACT:
It is known to attempt to plate chromium from a solution containing trivalent chromium salts and organic complexants. The invention provides an aqueous chromium electroplating system containing trivalent chromium, together with both a formate or acetate and a bromide. Optionally the solution also contains ammonium, borate, chloride, sulphate and alkali metal ions and a wetting agent. The invention has the advantage of providing a solution with commercially acceptable covering and throwing power whose effluent can easily be purified to acceptable standards.

REFERENCES:
patent: 2927066 (1960-03-01), Schaer
patent: 3706638 (1972-12-01), Bride
patent: 3706643 (1972-12-01), Huba
patent: 3729392 (1973-04-01), Bride
patent: 3788957 (1974-01-01), Christie et al.
patent: 3833485 (1974-09-01), Crowther et al.

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