CO-NI ALLOY ELECTRODEPOSITING METHOD FOR PRODUCING CO-NI ALLOY FOIL

摘要

PURPOSE:To produce the Co-Ni alloy foil having an excellent magnetic characteristic at a low cost by using an electrolyte contg. the specified amts. of the sulfamates of Ni and Co, a cathode having a passive film, and a soluble anode, and carrying out electrolysis under specified conditions. CONSTITUTION:The electrolyte contains Ni sulfamate and Co sulfamate respectively as Ni and Co sources. The electrolyte contains 1-60g/l of Ni ion and 1-60g/l of Co ion, and the concns. are changed in accordance with a desired Co-Ni electrodeposited alloy. Boric acid is further added to the electrolyte as a buffer to hold the pH at 2.0-4.0. Besides, MgCl2 is added to keep the current efficiency at about 100%. The electrolyte is used, and electrolysis is carried out with the cathode having a passive film and the soluble anode for keeping the ion concn. constant. In this case, the cathode current density is controlled to 5-10A/dm2 and the electrolyte temp. to 40-60 deg.C, and a Co-Ni alloy is electrodeposited on the cathode. By this method, the Co-Ni alloy foil having excellent magnetic characteristic and glossiness is efficiently obtained at a low cost.