| 摘要 |
PROBLEM TO BE SOLVED: To provide an electroless gold plating liquid which is non-cyan type and is excellent in stability, and a gold plating method which is excellent in operability and enables the production of a film of excellent property. SOLUTION: In this electroless gold plating liquid comprising a gold salt and a reducing agent, the gold salt is sodium gold sulfide and the reducing agent is one of catechol, pyrogallol, and gallic acid. The composition of plating liquid has preferably a gold salt concentration of 0.002-0.1 mol/L and a reducing agent concentration of 0.01-0.5 mol/L. Further in the gold plating method using this plating liquid, it is preferable that pH of the gold plating liquid is 5-9, the temperature of the gold plating liquid is room temperature to 75 deg.C and the object to be plated is immersed in the gold plating liquid.
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