Process for regenerating ammoniacal chloride etchants

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

C - Chemistry, Metallurgy

25

C

C25C 1/12 (2006.01) C23F 1/46 (2006.01)

Patent

CA 2052930

IMPROVED PROCESS FOR REGENERATING AMMONIACAL CHLORIDE ETCHANTS ABSTRACT OF THE DISCLOSURE 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.

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