| abstract |
An object of the present invention is a cyanide-type copper-tin that is strong in continuous impact resistance without peeling or cracking of the film due to continuous impact even when the film thickness is 2 μm or more, which is a problem in the plating of a nocyan-type copper-tin alloy. Providing a manufacturing method for alloy plating. SOLUTION: At least a soluble copper salt and a soluble tin in a material selected from (1) a metal or a ceramic having a metal layer on a surface layer, or (2) a material selected from a plastic having a metal layer on a surface layer. After electroplating in a copper-tin alloy plating bath not containing cyan composed of a salt, an organic acid and / or an inorganic acid and / or a soluble salt thereof, or a specific additive (brightening agent), (1) A method for producing a copper-tin alloy plating having excellent continuous impact resistance, wherein baking is performed under specific conditions different from those in (2). [Selection figure] None |