Electrolytic process for applying thin silver coatings to stainl

Details Electrolytic process for applying thin silver coatings to stainl Electrolytic process for applying thin silver coatings to stainl

1988-11-04

1989-12-12

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 34, 204 351, C25D 534, C25D 548

Patent

active

048865850

ABSTRACT:
In an electrolytic process of silvering stainless steel parts having a hardness of at least 58 HRc, the parts are subjected to degreasing with a solvent and by electrolysis in an alkaline atmosphere before undergoing electrolytic attack in an acid atmosphere, Wood prenickeling, electrolytic neutralization and then electroytic silvering in two successive distinct operations, these being a presilvering operation in a cyanide bath such that the free KCN/metal Ag ratio is at least 15, and a silvering operation in a similar bath which also contains potash and in which the free KCN/metal Ag ratio is about 10 times lower than in the presilvering bath. The process enables thin, adherent silver coatings to be deposited in a consistent manner on stainless steel parts, such as ball or roller races, before applying a self-lubricating coating to the parts.

REFERENCES:
Chemical Abstracts, vol. 102, No. 24, Jun. 17, 1985, p. 514.
Chemical Abstracts, vol. 97, No. 18, Nov. 1, 1982, p. 567.
Metal Finishing, vol. 48, No. 5, May 1986, pp. 35-38; J. B. Mohler, et al.

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