MEMBER FORMED WITH COATING FILM HAVING TIN AS ITS MAIN COMPONENT, COATING FILM FORMING METHOD AND SOLDERING METHOD

摘要

A member having a coating film capable of suppressing whisker generation is provided. The coating film (3) including a plurality of crystalline grains (3a) made of tin or tin alloy is formed above the surface of the base member (1). An intermetallic compound (3b) of tin and the first metal is being formed along the crystalline grain boundaries of the coating film.