Letter 7057

Need product to remove copper oxidation

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I'm a chemical engineering and I work with copper in my job. I need a copper cleaner, a product that removes the superficial oxidation in copper. I have used nitric acid, but the oxidation remain. thanks

Marcelo Tirelli
- Lorena, Sao Paulo, Brazil

If you can handle HNO3 you can probably handle this solution:

120 g/L sodium persulfate

30 mL/L concentrated sulfuric acid

This is actually a copper etch; there will be metal removal and the resultant surface will be active. A benzotriazole or citric acid solution can prevent further tarnishing.

James Totter, CEF - Tallahassee, FL

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