Process for the accelerated etching and refining of metals in am

Details Process for the accelerated etching and refining of metals in am Process for the accelerated etching and refining of metals in am

1993-11-24

1995-05-23

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204130, C25F 302, C25F 702

Patent

active

054178185

ABSTRACT:
Traditional recommendations consider the nitrate that occurs in the electrolysis cell as an interfering factor and attempt to remove the nitrate completely or largely from the etching solution. In accordance with the invention, it is recommended to operate the etching installations with a certain optimum nitrate content which brings about a considerable acceleration of etching speed and to realize an upper limit only by adding reducing agents whereby the reducing agents have the added advantage that for example in the electrolysis cell they favor the conversion from copper II to copper I.

REFERENCES:
patent: 4280887 (1981-07-01), Konstantouros
patent: 4490224 (1984-12-01), Warheit
patent: 4545877 (1985-10-01), Hillis
patent: 4557811 (1985-12-01), Furst et al.
patent: 5248399 (1993-09-01), Meguro et al.

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