ELECTROLYTICALLY ETCHING COPPER SURFACE WITH SOLUTION CONTAINING FERRIC SULPHATE AND COPPER ION

摘要

ELECTROLYTICALLY ETCHING COPPER SURFACE WITH SOLUTION CONTAINING FERRIC SULPHATE AND COPPER ION Method of etching of surfaces of copper or copper alloys by means of an acidic 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/dm2.