Chemistry: electrical and wave energy – Processes and products
Patent
1985-09-20
1986-10-14
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204 53, 204 541, C25D 332, C25D 336, C25D 356, C25D 360
Patent
active
046170979
ABSTRACT:
A process and bath for electroplating tin, lead and tin-lead alloys. Improved brightness, solderability and broader current density ranges are achieved by the use in the baths of a soluble alkylene oxide condensate to provide a cloud point of the bath above about 90.degree. F., a soluble bismuth compound, an aromatic aldehyde and acetaldehyde. Tin and lead are supplied to the bath as salts of alkyl or alkylol sulfonic acids with sufficient free alkyl or alkylol sulfonic acid to provide a bath pH of less than 3.
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Dohi et al., "Bright Solder and Indium Plating from Methane Sulfonic Acid", Proceeding of Electroplating Seminar, 7/78.
Dohi et al., "Electrodeposition of Bright Tin-Lead Alloys from Alkanolsulfonate Baths", Proceedings of Interfinish 80.
Nobel Fred I.
Ostrow Barnet D.
Schram David N.
Kaplan G. L.
Lea-Ronal, Inc.
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