Tin, lead, or tin-lead alloy plating bath

摘要

A tin, lead, or tin-lead alloy plating bath comprising, as essential ingredients, an alkali metal salt, and a soluble divalent tin compound or/and a lead compound, all of an aliphatic or aromatic sulfocarboxylic acid of the general formula <IMAGE> wherein R is a C1-4 hydrocarbon radical, M1 is a hydrogen atom or alkali metal atom, M2 is an alkali metal atom, and X1 and X2 are each a hydrogen atom, OH, COON, or SO3N (where N represents a hydrogen atom or alkali metal atom).