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

1994-06-30

1995-09-26

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Depositing predominantly single metal coating

205284, 205290, C25D 310

Patent

active

054531756

ABSTRACT:
The present invention provides an improved method for electroplating chromium, using lead anodes, while achieving the advantages of using methanesulfonic acid without suffering the excessive anode-corrosion characteristics associated with that acid. Accordingly, chromium is electrodeposited from a bath containing chromic acid, sulfate ion and an alkylpolysulfonic acid containing from one to about three carbon atoms. The preferred alkylpolysulfonic acid is methanedisulfonic acid.

REFERENCES:
patent: 5176813 (1993-01-01), Newby

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