VERFAHREN ZUR ELEKTROCHEMISCHEN KOMPENSATION DER LUFTOXIDATION BEI DER ELEKTROCHEMISCHEN REGENERIERUNG VON CHLORIDHALTIGEN KUPFERAETZLOESUNGEN

• Main Authors: REITH, HERIBERT, 7000 STUTTGART, DE, OTT, RUDI. DR., 7145 MARKGROENINGEN, DE
• Format: Patent
• Language: German
• Published: 14.03.1985
• Edition: 3
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE

1. Process for electrochemical compensation of air oxidation in the electrochemical regeneration of etching solutions containing copper chloride, the etching solution being passed through a regeneration unit with a cathode and an insoluble anode, to which direct voltage is applied, so that metallic copper is deposited at the cathode, whereas chlorine, which oxidises the copper (I) chloride to copper (II) chloride, is formed at the anode, characterized in that, for the purpose of dissociating water into gaseous oxygen and hydrogen ions, the anode is surrounded by a porous material which acts as a diaphragm and impedes access of chloride ions to the anode.