Chemistry: electrical and wave energy – Processes and products
Patent
1983-12-22
1986-07-08
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204 53, 204 54R, C25D 332, C25D 336, C25D 356, C25D 360
Patent
active
045991499
ABSTRACT:
This invention relates to the electrodeposition of tin, lead and particularly tin-lead alloys from an electroplating bath comprising a lead and/or tin alkylsulfonate, and alkylsulfonic acid in a sufficient amount to impart a pH below about 3 to the bath, and various additives to improve the brightness of the deposits, the useful current density ranges, and/or the solderability of tin-lead alloy deposits including quaternary nitrogen wetting agents containing a fatty acid radical, alkylene oxides, pyridine compounds, aromatic aldehydes, acetaldehyde and/or a bismuth compound. The bath is formulated to have a cloud point above about 90.degree. F.
REFERENCES:
patent: 2525942 (1950-10-01), Proell
patent: 3663384 (1972-05-01), Lescure
patent: 3905878 (1975-09-01), Dohi et al.
patent: 4000047 (1976-12-01), Ostrow et al.
patent: 4132610 (1979-01-01), Dohi et al.
patent: 4384930 (1983-05-01), Eckles
patent: 4388158 (1983-06-01), Inui et al.
patent: 4459185 (1984-04-01), Obata et al.
Dohi et al., "Bright Solder and Indium Plating from Methane Sulfonic Acid", Proceeding of Electroplating Seminar, Jul. 1978.
Nobel Fred I.
Ostrow Barnet
Schram David N.
Kaplan G. L.
Lea-Ronal, Inc.
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