| 摘要 |
PROBLEM TO BE SOLVED: To provide a tin-bismuth alloy electroplating bath capable of obtaining a film having excellent solderability even after heating treatment. SOLUTION: This bath contains (A) at least one kind selected from the stannous salt of alkanesulfonic acid and the stannous salt of alkanolsulfonic acid, (B) at least one kind selected from the bismuth salt of alkanesulfonic acid and the bismuth salt of alkanolsulfonic acid, (C) at least one kind selected from alkanesulfonic acid and alkanolsulfonic acid, (D) a nonionic surface active agent, (E) an oxidation preventive and (F) a monohydroxynaphthalene compd.
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