Study on Present Situation and New Trends of the Electrodeposition of Nickel-Cobalt Alloy

摘要

Nickel-cobalt alloys have broad application prospect for their excellent properties (i.e. high microhardness, strength, abrasion, corrosion resistance and magnetic properties.etc). Present situation and new trends on mechanism of the anomalous codeposition and technology of electrodepostion of nickel-cobalt were studied. Effects of electrolysis parameters (e.g. concentration of co~(2+)in the electrolyte, cathodic current density, pH value, temperature. etc) on the alloy composition, morphology and mechanical properties were analyzed. The formation of the monovalent intermediate (hydroxides or colloid) may cause the cobalt preferential deposition or the faster charge-transfer of Co2+ reduction compared to that of Ni~(2+) reduction is the main factor that causes the anomalous codeposition behavior of the nickel-cobalt alloy.