JPS5935433B

PURPOSE:To carry out tin plating of approximately uniform thickness and make the reutilization of the soln. after the plating treatment possible by subjecting an object to be plated consisting of an alloy consisting essentially of a metal nobler than tin to a heat treatment in the presence of an aq. soln. contg. tin powder and tin ions. CONSTITUTION:In the case of using, for example, powder, as an object to be plated consisting of an alloy consisting essentially of a metal nobler in standard electrode potential than tin, tin powder is mixed with the powder to be plated. An aq. soln. contg. tin ions is added to this mixture and the mixture is heated under stirring. The product of the plating completed of reaction is filtered, and is removed of liquid components, after which it is washed and the tin plating powder is recovered. On the other hand, the filtrate is the aq. soln. contg. tin ions alone as metallic ion and therefore it is circulated as it is to the plating proces and is reutilized. In case when the object to be plated is a plate, the plate is immersed in an aq. soln. contg. tin ions suspended with tin powder and is heated.