PULSED ELECTRODEPOSITION OF IRON-NICKEL ALLOYS

The effects of dc, pulse, and pulse reverse current waveforms on deposition of Fe-Ni alloys have been studied in unagitated solutions and with a rotating cylindrical electrode. A nickel sulfamate/ferrous chloride electrolyte system at pH 2 with additives was used. Pulse plating resulted in an increase in iron content of deposits, especially at current densities less than 2 A/dm2. Pulse reverse plating led to a decrease in anomalous deposition at low current densities. Rotating cylindrical electrodes indicated significant mass transfer effects at high current densities. During pulse reverse plating an increase in anodic pulse magnitude decreased anomalous deposition; pulse frequency had its greatest effect in reducing anomalous deposition between 100 and 300 Hz. © 1990, The Electrochemical Society, Inc. All rights reserved.