The influence of pulsating current on high rate transpassive dissolution of nickel in 6 M NaNO3 has been investigated. Obtained results indicate that current efficiency for nickel dissolution is influenced by pulse time and to a certain extent by relaxation time and is related to the anion build up at the anode. Dissolution efficiency for a given average current density is higher under pulsating current than direct current conditions. The influence of different pulse parameters on the anode potential and on the onset of sparking are investigated. The use of a pulsating current provides additional possibilities to influence the transpassive dissolution behavior in electrochemical machining and surface finishing operations.
Dr. Madhav Datta and Landolt, D., “High rate transpassive dissolution of nickel with pulsating current”, Electrochimica Acta, vol. 27, pp. 385–390, 1982.