Protection of lead-containing anodes during chromium electroplat

Details Protection of lead-containing anodes during chromium electroplat Protection of lead-containing anodes during chromium electroplat

1990-11-05

1993-01-05

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Depositing predominantly single metal coating

205290, C25D 310

Patent

active

051768135

ABSTRACT:
The present invention provides a process for electroplating chromium using lead anodes while achieving the advantages of using methanesolfonic acid without suffering the excessive anode-corrosion characteristics associated with that acid. Accordingly, chromium is electrodeposited from a bath containing chromic acid, sulfate and an alkylpolysulfonic acid containing from one to about three carbon atoms. The invention also provides a plating process for chromium electrodeposition, a plating bath for use in the inventive process, and a replenishment composition for existing plating baths.

REFERENCES:
patent: 4588481 (1986-05-01), Chessin et al.
patent: 4786378 (1988-11-01), Newby
patent: 4810337 (1989-03-01), Newby
Dennis, J. K., et al. "Nickel and Chromium Plating" John Wiley & Sons, New York, 1972 pp. 205-206.

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