METHOD FOR PRODUCTION OF TIN-COBALT,TIN-NICKEL,OR TIN-LEAD BINARY ALLOY ELECTROPLATING BATH AND ELECTROPLATING BATH PRODUCED THEREBY

摘要

An electroplating bath for the formation of a tin-cobalt, tin-nickel, or tin-lead binary alloy coating is produced by mixing (a) as alloy coating-forming agent at tin salt and one member selected from the group consisting of a cobalt salt, a nickel salt, and a lead salt, (b) 1-hydroxyethane-1,1-diphosphoric acid and/or a salt thereof, (c) methanesulfonic acid and/or an alkali salt thereof, and (d) an electroconductive salt. A coating formed by the electroplating using the bath is stable and excellent in gloss.