METHOD FOR ELECTRODEPOSITING NIOBIUM AND NIOBIUM ALLOY AND ELECTRODEPOSITION BATH

摘要

PURPOSE:To obtain high purity Nb and Nb alloy by a simple method at a low temp. with high mass productivity by carrying out electrolysis with an ordinary temp. type molten salt bath consisting of niobium halide and a specified arom. org. solvent. CONSTITUTION:An electrodeposition bath is composed of 1-70mol% anhydrous niobium halide and 20-80mol% alkylpyridinium halide or alkylimidazolium halide. Electrolysis is carried out with the bath at 0-150 deg.C under a jet or irradiating ultrasonic waves by supplying DC or pulsating current at 0.1-30A/dm2 current density to obtain high purity Nb or Nb alloy on the cathode. Aluminum halide or titanium halide may be added to the bath or alkali halide may further be added so as to lower the m.p. of the bath.