VERFAHREN ZUM SELEKTIVEN LOESEN VON MOLYBDAEN IN GEGENWART VON WOLFRAM

• Main Authors: VADASDI, KAROLY, TEKULA, ENDRE, BARTHA, LASZLO, KISS, ANDRAS, MILLNER, TIVADAR
• Format: Patent
• Language: German
• Published: 15.04.1985
• Edition: 4
• 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. A process for selectively dissolving molybdenum in the presence of tungsten, particularly for selectively dissolving the tungsten core-wire from tungsten spirals manufactured on a molybdenum core-wire, with an acid solution of 1 or more compound(s) having oxygen in peroxide-oxygen bond, characterized in that one carries out the dissolving with an acid solution which does not contain nitric acid in the presence of 1 or more compound(s) of 1 or more of the elements iron, copper, thallium, silver, lead, chromium, nickel, bismuth, tellurium, cerium, titanium, vanadium, manganese and cadmium as a catalyst(s) which selectively accelerates (accelerate) the dissolving of the molybdenum.