Process for regenerating ammoniacal chloride etchants

Details Process for regenerating ammoniacal chloride etchants Process for regenerating ammoniacal chloride etchants

1990-11-16

1992-02-04

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156656, 156666, 156345, 204106, 204237, B44C 122, C23F 100, C23C 112, C25B 1500

Patent

active

050857304

ABSTRACT:
A process is described for the direct electrolytic regeneration of chloride-based ammoniacal copper etchants without generating any significant amount of gaseous chlorine. The electrolysis is carried out using an etch resistant metal cathode and an anode which can be carbon, or an etch resistant metal optionally coated with a noble metal oxide. The process can be adapted to a closed loop system for maintaining at a substantially constant level the amount of copper present in an operating ammoniacal chloride etchant bath.

REFERENCES:
patent: 3784455 (1974-01-01), Parikh et al.
patent: 4564428 (1986-01-01), Furst
patent: 4576677 (1986-03-01), Faul et al.
patent: 4784785 (1988-11-01), Cordani et al.
patent: 4915776 (1990-04-01), Lee
patent: 4944851 (1990-07-01), Cordani et al.
patent: 4957611 (1990-09-01), Collini

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