| abstract |
This tin or tin-alloy plating liquid comprises: (A) a soluble salt including at least a stannous salt; (B) an acid selected from among organic acids and inorganic aids, or a salt thereof; (C) a surfactant; (D) a leveling agent; and (E) an additive, wherein the surfactant is a compound (C1) represented by general formula (1) and/or a compound (C2) represented by general formula (2). In formulas (1) and (2): R represents an alkyl group having 7-13 carbon atoms; 'm' is 5-11; 'n' is 1-3; and 'm' and 'n' are different from each other. |