Electrodeposition of CuSn Alloy from Noncyanide Sulfosuccinate Bath
Recently the regulation of nickel usage because of allergy issues has been strengthened in Europe and other countries. The Cu-Sn alloy (40-55 mass%Sn) is called “speculum alloy” or “white bronze” and has a silvery-white appearance. We developed a noncyanide Cu-Sn alloy plating bath consisting of sulfosuccinic acid, L-methionine and polyoxyethylene-α-naphthol, from which silvery-white Cu-Sn alloy (40-55mass%Sn) were obtained. It is anticipated that the Cu-Sn alloy films will be used as an alternative to nickel undercoating for decorative gold or chromium electroplating.
Jian-Feng Nie and Allan Morton
T. Nakamura et al., "Electrodeposition of CuSn Alloy from Noncyanide Sulfosuccinate Bath", Materials Science Forum, Vols. 654-656, pp. 1912-1915, 2010