| 摘要 |
PROBLEM TO BE SOLVED: To provide a tin plating solution which is less susceptible to forming a sludge even after the storage for a long time and has a markedly long life as a plating solution. SOLUTION: A tin plating solution for carrying out an electrolytic tin plating, characterized in that it contains a tin salt as a supply source of a tin ion in an amount of 5 to 30 g/L in terms of tin, a chelating agent for chelating and stabilizing the tin ion and a pH adjusting agent; and a method for preparing the tin plating solution, characterized in that it comprises adding tin methanesulfonate into a solution being neutral to alkaline, to thereby form a tin chelate complex. COPYRIGHT: (C)2007,JPO&INPIT
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