Being coat burble manner of the tinning treatment

摘要

PROBLEM TO BE SOLVED: To provide a method for peeling coating film of a tin plated material by which the material is returned to a state before plating in a short time.;SOLUTION: The method for peeling a coating film of the tin plated material having an under layer formed on the surface of the base material and a tin alloy surface layer formed on the surface of the under layer includes following steps: first the tin alloy surface layer is dissolved in a degree that at least a part of the under layer is exposed by immersing the tin alloy plated material in a surface layer dissolving solution 50 of an acidic solution or an alkaline solution containing fluorine or a fluorine compound and applying voltage to pass current between energization electrode plates 61 and 62. Next, the tin plated material in which the under layer is partially exposed is immersed in an under layer dissolving solution. As a result, the under layer is dissolved in the under layer dissolving solution and the tin alloy surface layer remaining on the tin plated material is peeled off from the under layer. Because the method is not necessary for dissolving the tin alloy surface in all, the material is returned to the state before plating in a short time.;COPYRIGHT: (C)2010,JPO&INPIT