C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/39
C25C 1/14 (2006.01)
Patent
CA 1046977
Abstract of the Disclosure The invention disclosed herein relates to the electrolytic deposition of bright tin and tin-lead alloy. This invention is embodied in a new plating bath and a plating both additive. The new plating bath includes tin or tin and lead ions, sulfuric acid or fluoboric acid, and the new additive. The new additive includes an emulsified naphthalene monocarbox- aldehyde with or without a substituted olefin, having the general formula: Image in which R2 is carboxyl, carboxamido, alkali carboxylate, ammonium. carboxylate, amine carboxylate, or alkyl carboxylate, and R2, R3, and R4 are hydrogen or lower alkyl. Prior brightener systems require specific surfactants to be used since their brightening ability is essential in the performance of the system as whole, whereas the emulsified naphthalene monocarbox- aldehyde of the present invention produces a brightness without dependence distinct types of emulsifiers and amines.
282821
Eckles William E.
Rosenberg William E.
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