Protection of lead-containing anodes during chromium electroplating
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United States of America Patent
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Jan 5, 1993
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N/A
app pub date -
Nov 5, 1990
filing date -
Nov 6, 1989
priority date (Note) -
Expired
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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.
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