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Title: Chromium electroplating baths

Abstract: In trivalent chromium electroplating baths of the type which comprise an aqueous solution of a complex of trivalent chromium with a carboxylic acid such as a glycolic acid and a halide such as a chloride, the invention provides an improvement by adding ammonia to the baths in a proportion of at least 0.05 moles per liter, thereby obtaining substantially improved covering power.


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Inventors: Crowther, John C. (Stourbridge, EN)

Application Number: 717765
Filing Date: 1976-08-25
Publication_date: 1977-10-11
Assignee: Albright & Wilson Limited (Warley, EN)
Primary Class(es): 205/286 205/289, 205/290
Other Classes:
US Patent Ref:
3006823Oct, 1961Deyrup204/51.
3706639Dec, 1972Bride et al.204/51.
3733346May, 1973Bride204/51.
3733347May, 1973Bride204/51.
3788957Jan, 1974Christie et al.204/51.
3833485Sep, 1974Crowther et al.204/43.
3954574May, 1976Gyllenspetz et al.204/51.

Other Refs: 668,751
Nov, 1929FR

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