| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of tin whiskers by a method, wherein a tin apply layer containing a predetermined amount of one metal selected from antimony, indium, bismuth, and palladium is formed on the surface of an external terminal. SOLUTION: In this electrolytic capacitor, a layer (tin alloy layer) 20 composed of tin containing a prescribed metal is formed on the surface of an external terminal 10, and this external terminal is welded to an aluminum rivet 11, and a metal is included in a welding part 12, whereby the occurrence of tin whiskers is restrained. As a metal included in tin, any one of antimony, indium, bismuth, and palladium will do. Furthermore, a composition of the tin alloy layer 20 containing these metals was explored, and as the results, it is decided that the content of these metals is in the range of 0.5 to 10.0 wt.%. Thus, the electrolytic capacitor in which a leakage current is low, and there is not possibility that a short-circuit occurs is superior in characteristics and reliability, and can be manufactured only by changing a plating material of the external terminal.
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