Process for direct gold plating of stainless steel

Details Process for direct gold plating of stainless steel Process for direct gold plating of stainless steel

1981-09-17

1983-12-27

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 46G, C25D 536

Patent

active

044229062

ABSTRACT:
Stainless steel can be directly plated with gold by a process wherein stainless steel is dipped in an activating solution; the activated stainless steel is subjected to cathodic electrolysis in a cathode electrolytic activation solution and then the treated stainless steel is directly plated with gold. A preferable activating solution contains (i) 3-20 wt. % of HCl, (ii) 2-30 wt. % of H.sub.2 SO.sub.4, (iii) 0.1-5 wt. % of a nonionic or cationic surfactant and (iv) 0.1-20 wt. % of 2-pyrrolidone or N-alkyl-2-pyrrolidone. A preferable cathode electrolytic activation solution contains (i) 5-20 wt. % of H.sub.3 PO.sub.4, (ii) 2-10% HNO.sub.3, (iii) 0.1-5 wt. % of a nonionic or cationic surfactant and (iv) 0.1-20 wt. % of 2-pyrrolidone or N-alkyl-2-pyrrolidone.

REFERENCES:
patent: 2133996 (1938-10-01), Underwood
patent: 3066084 (1962-11-01), Osterman, Jr. et al.
patent: 3654099 (1972-04-01), De Bruyne

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