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topic 11450

Treatment procedure for chromic acid bath


I'm looking for a procedure to treat a chromic strip bath. The make up is 12.5% chromic acid flake and 12.5% phosphoric acid. The balance is DI water. Could anyone tell me how to properly treat this solution using sodium metabisulfite and an ORP meter. I have about 500 gals of this bath that I need to dump.


Michael Murphy


Get access to a copy of Durney's Electroplating Engineering Handbook. The information is there.

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Tom Pullizzi
Falls Township, Pennsylvania

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