Patent ID: 9657403
Date: 2017-05-23
CPC Classifications: C25D

Claim:
1. A method of preparing a tin-silver (Sn—Ag) alloy plating solution comprising methanesulfonic acid tin, methanesulfonic acid silver, methanesulfonic acid, and an additive, the method comprising: preparing the methanesulfonic acid by eliminating impurities therein, the impurities comprising released chloride compounds and released sulfur compounds; preparing the methanesulfonic acid tin and the methanesulfonic acid silver by dissolving, through an electrolytic process, tin and silver in a part of the prepared methanesulfonic acid; producing a mixture solution by adding a part of the prepared methanesulfonic acid, the methanesulfonic acid tin, the methanesulfonic acid silver, and the additive; and filtering the mixture solution, wherein: