Patent ID: 8277630

Claim:
An electrolytic tin plating solution for chip components, comprising: (1) stannous ions; (2) a complexing agent; (3) a nonionic surfactant; and (4) an antioxidant; wherein the nonionic surfactant contains a compound expressed by the following General Formula (A) and a compound expressed by the following General Formula (B) R—(C 6 H 4 )—RO(CH 2 CH 2 O) n H General Formula (A) where R represents a straight or branched alkyl group with between 1 and 20 carbon atoms, and n represents an integer between 1 and 10, HO—(C 2 H 4 O) l —(C 3 H 6 O) m —(C 2 H 4 O) n —H General Formula (B) where l represents an integer between 1 and 10, m represents an integer between 1 and 10, and n represents an integer between 1 and 10.