Method of processing the surface of workpieces including particu

Details Method of processing the surface of workpieces including particu Method of processing the surface of workpieces including particu

1979-11-20

1981-05-05

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, 204130, C25F 314, C25F 500

Patent

active

042657229

ABSTRACT:
Method of etching of surfaces of copper or copper alloys by way of an aci solution containing an oxidizing agent. After removal of the copper surface, the etching solution is passed for regeneration of the oxidizing agent through an electrolysis cell having an anode and a cathode, with copper being deposited on the cathode. The etching solution is maintained free of chloride ions and contains as the oxidizing agent ferric sulfate in a concentration of up to about 140 g of Fe/1 etching solution, whereby the copper content of the etching solution is adjusted to at least 10 g Cu per liter etching solution, while the current density in the electrolysis cell is maintained at at least 2A/dm.sup.2.

REFERENCES:
patent: 3622478 (1971-11-01), Beyer
patent: 3788915 (1974-01-01), Gulla
patent: 3974050 (1976-08-01), Divisek
patent: 4131523 (1978-12-01), Faul
patent: 4153531 (1979-05-01), Faul

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