Protection of lead-containing anodes during chromium electroplating
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United States of America Patent
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Sep 26, 1995
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app pub date -
Jun 30, 1994
filing date -
Nov 6, 1989
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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.
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