ANTI-DISPLACEMENT HARD GOLD COMPOSITIONS

摘要

PURPOSE: An anti-substitution hard gold composite is provided to prevent the substitution of hard gold on nickel and nickel alloy by adding mercapto - tetrazole in a hard gold plating composite. CONSTITUTION: An anti-substitution hard gold composite comprises a gold ion source, an alloy metal ion supply source and mercapto-tetrazole. The gold ion source supplies one or more gold sources. The alloy ion source supplies cobalt salt or nickel salt. The mercapto-tetrazole 1~5 mg/L is included in a hard gold plating composite.