Naphthalene monocarboxaldehyde bath for electrolytically...

Details Naphthalene monocarboxaldehyde bath for electrolytically... Naphthalene monocarboxaldehyde bath for electrolytically...

C - Chemistry, Metallurgy

25

C

204/39, 204/27.5

C25C 1/14 (2006.01) C25D 3/32 (2006.01) C25D 3/60 (2006.01)

Patent

CA 1046976

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 bath additive. The new plating bath includes tin or tin and lead ions, sulfuric acid or fluoboric acid, and the new additive. The new additive is an emulsified or dissolved naphthalene monocarboxaldehyde with or without a substituted olefin, having the general formula: Image in which R1 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 a whole, whereas the emulsified naphthalene monocarboxaldehyde of the present invention produces a brightener without dependence on distinct types of emulsifiers and amines.

217157

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