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Primary Examiner: Kaplan, G. L.
Assistant Examiner:
Attorney: Brumbaugh, Graves, Donohue & Raymond

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Title: Trivalent chromium electroplating baths and method

Abstract: An aqueous trivalent chromium plating bath having low temperature stability comprising trivalent chromium ions preferably in a concentration of at least 0.2 M, sulphate ions preferably in a concentration of at least 0.3 M, a weak complexing agent for the chromium ions in a concentration of at least 0.1 M, and fluoride ions in a concentration of at least 0.025 M. The bath preferably also contains chloride ions in a concentration of at least 0.1 M.


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Inventors: Ward, John Joseph Bernard (Wantage, GB)
Barnes, Clive (Wantage, GB)

Application Number: 853326
Filing Date: 1977-11-21
Publication_date: 1978-08-15
Assignee: International Lead Zinc Research Organization, Inc. (New York, NY)
Primary Class(es): 205/286 205/289, 205/290
Other Classes:
US Patent Ref:
3917517Nov, 1975Jordan et al.204/51.
3954574May, 1976Gyllenspetz et al.204/51.

Other Refs: 219,356
Aug, 1968SU
Other References: Larissa Domnikov, Metal Finishing, pp. 107-109, Jun. 1966.