Patent ID: 9023228
Filing Date: 2015-05-05
Classification: B44C,C08J,C09K,C23C

Abstract:
1. A pickling solution for the surface pre-treatment of plastic surfaces in preparation for metallization, the solution comprising: Mn(VII) ions; and an inorganic acid, wherein the inorganic acid is at least one acid from the group consisting of phosphoric acid, peroxomonophosphoric acid, peroxodiphosphoric acid, sulfuric acid, peroxomonosulfuric acid and peroxodisulfuric acid, and the inorganic acid has a concentration between 1 and 18.5 mol/l; wherein the pickling solution is substantially free of chromium (VI) ions, alkali ions, and alkaline-earth ions, wherein the Mn(VII) ions are present at a concentration of between 0.001 and 0.5 mol/l and the Mn(VII) ions are obtained by means of an oxidation cell from a Mn-ion of an oxidation state lower than (VII); and wherein the pickling solution maintains a pickling effect at an operating temperature of between about 55° C. and about 80° C. for greater than 24 hours.