| 摘要 |
There is provided an improved gold alloy electroplating bath comprising glycolic acid, an alkali metal salt of glycolic acid, and an allaying metal plus a chelating agent capable of forming a stable complex with metal impurities, particularly nickel. The chelating agent, the complexes formed and the decomposition products of the chelating agent are substantially innocuous to the functioning of the bath and to the quality of a deposit from the bath. Nitrilotriacetic acid is the preferred chelating agent.
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