Stripping Indium Plating

Diffused indium plate cannot be stripped from bronze. Undiffused indium on bronze can be removed with hydrochloric acid. Lead-indium plating, either diffused or undiffused, can be removed by immersion in a mixture of 9 parts glacial acetic acid and 1 part 30% hydrogen peroxide at room temperature. Indium and silver-indium alloy can be removed from steel by reversing the current in 30 g/L (4 oz/gal) solution of sodium cyanide at approximately 50 to 55 °C (122 to 131 °F). The silver-indium alloy can be removed in 1:1 nitric acid, but care must be taken to remove it from the bath before the steel is etched.

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