| 摘要 |
The present invention provides a non-cyanide-type gold-tin alloy plating bath comprising : (i) at least one water-soluble gold compound, (ii) at least one completing agent for gold, (iii) at least one water-soluble tin compound, and (iv) at least one component selected from the group consisting of cationic macromolecular surfactants and cationic macromolecular compounds. By using the non- cyanide-type gold-tin alloy plating bath of the present invention, a gold-tin alloy plating film having good brightness, reflow properties and the like can be formed.
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