abstract |
The present invention provides a tin alloy electroplating bath, which contains (A) a soluble tin salt, (B) at least one of a soluble nickel salt and a soluble cobalt salt, (C) a hydroxycarboxylic acid or a salt thereof, and (D) a nitrogen-containing salt Heterocyclic unsaturated compound and (E) surfactant, the pH of the tin alloy electroplating bath is 3-7. |