| 摘要 |
PROBLEM TO BE SOLVED: To provide an electroless gold plating bath by which plating can stably be performed at a relatively low temperature under the approximately neutral pH condition, and a gold plating film excellent in plating appearance can be obtained. SOLUTION: This electroless gold plating bath is obtained by adding cyanide or the complex salt thereof by 0.1 ng/L to 1 g/L as KCN to an electroless gold plating bath containing non-cyanided gold salt, a complexing agent and a reducing agent and has pH of 3.0 to 9.5.
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