Title: Trivalent chromium electroplating baths and electroplating therefrom

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.

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Inventors: Gyllenspetz, Jeffrey (Kidderminster, EN)
Renton, Stanley (Penkridge, EN)

Application Number: 530158
Filing Date: 1974-12-06
Publication_date: 1976-05-04
Assignee: Albright & Wilson Limited (Oldbury, EN)
Primary Class(es): 205/243 205/286, 205/287, 205/289, 205/290
Other Classes:
US Patent Ref:

2927066	Mar, 1960	Schaer	204/43.
3706638	Dec, 1972	Bride	204/51.
3706643	Dec, 1972	Huba	204/51.
3729392	Apr, 1973	Bride	204/51.
3788957	Jan, 1974	Christie et al.	204/51.
3833485	Sep, 1974	Crowther et al.	204/43.

Other Refs:
Primary Examiner: Kaplan, G. L.
Assistant Examiner:
Attorney: Flynn & Frishauf