Electroplating bath for the electrodeposition of tin and tin/cad

Details Electroplating bath for the electrodeposition of tin and tin/cad Electroplating bath for the electrodeposition of tin and tin/cad

1979-02-16

1980-06-10

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 43R, 204 54R, C25D 332, C25D 356, C25D 360

Patent

active

042071488

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: ##STR1## where n and m are zero or 1, and when n is 1, m is zero and when m is 1, n is zero, R.sub.1 is hydrogen or a lower alkyl group, and when both m and n are zero, R.sub.2 and R.sub.3 are hydrogen or lower alkyl groups and R.sub.4 is a formyl, alkyl carbonyl, carboxamido, or carboxy group or mixtures thereof, and when R.sub.4 is a formyl or alkyl carbonyl group or mixtures thereof, R.sub.1 or R.sub.2 is a lower alkyl group; when n is 1, the combination of R.sub.2 and Z represent ethenylene and R.sub.3 is an oxygen or sulfur radical, and R.sub.4 is as above; when m is 1, the combination of R.sub.2 and Z.sup.1 represent alkylene, R.sub.3 is hydrogen or a lower alkyl group and R.sub.4 is a carbonyl group.
Alternatively, the formaldehyde can be deleted and an aldehyde or ketone can be used in conjunction with a carboxylic acid or an amide, both as above defined.

REFERENCES:
patent: 2315802 (1943-04-01), Lind et al.
patent: 3361652 (1968-01-01), Korpiun et al.
patent: 3471379 (1969-10-01), Schoot et al.
patent: 3616306 (1971-10-01), Conoby et al.
patent: 3769182 (1973-10-01), Hsu
patent: 3875029 (1975-04-01), Rosenberg et al.
patent: 3956123 (1976-05-01), Rosenberg et al.

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