Electroplating bath for the electrodeposition of tin and...

Details Electroplating bath for the electrodeposition of tin and... Electroplating bath for the electrodeposition of tin and...

C - Chemistry, Metallurgy

25

D

204/39, 204/27.5

C25D 3/32 (2006.01) C25D 3/56 (2006.01) C25D 3/60 (2006.01)

Patent

CA 1077430

ABSTRACT An acidic electroplating bath for providing a bright tin or tin/cadmium deposit containing stannous ions or mixtures of stannous and cadmium ions, a free acid, a non-ionic surfactant and as a brightener system a ring-halogenated aryl aldehyde, formaldehyde, and at least one compound of the formula: Image where n is zero or 1, m is zero or 1, and when n is 1, m is zero, and when m is 1, n is zero, R1 is hydrogen or a lower alkyl group, and when both m and n are zero, R2 and R3 are hydrogen or lower alkyl groups and R4 is a formyl, alkyl carbonyl, carboxamido, or carboxy group or mixtures thereof, and R4 is a formyl or alkyl carbonyl group or mixtures thereof, R1 or R2 is a lower alkyl group; when n is 1, the combination of R2 and ? represent ethenylene and R3 is an oxygen or sulfur radical, and R4 is as above; when m is 1, the combination of R2 and ?1 represent alkylene, R3 is hydrogen or a lower alkyl group and R4 is a carbonyl group.

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