Electroplating tin and tin alloys and baths therefor

Details Electroplating tin and tin alloys and baths therefor Electroplating tin and tin alloys and baths therefor

1981-04-02

1982-08-31

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 43S, 204 54R, C25D 360

Patent

active

043471072

ABSTRACT:
Improved electroplating bath for depositing bright, metallic tin wherein divalent tin, in the form of stannous sulfate or fluoroborate, is present in conjunction with sulfuric or fluoroboric acid, brighteners including an aromatic amine and an aliphatic aldehyde, a polyalkylene ether surfactant, and an aromatic sulfonic acid to ensure bath stability as well as the requisite brightness. The divalent tin-containing electroplating bath may also be provided with copper or rhodium salts to achieve codeposition of tin with at least one of these alloying metals. The method of utilizing such divalent tin electroplating baths to plate substrates with bright metallic tin is also described and claimed.

REFERENCES:
patent: 3616291 (1971-10-01), Wilson
patent: 3749649 (1973-07-01), Valayil
patent: 3785939 (1974-01-01), Hsu
patent: 3905878 (1975-09-01), Dohi et al.
patent: 3926749 (1975-12-01), Passal
patent: 4132610 (1979-01-01), Dohi et al.
patent: 4135991 (1979-01-01), Canaris et al.

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