The anodic dissolution of nickel—II. Bromide and iodide electrolytes

The kinetics of the anodic dissolution of nickel were studied in acidic bromide and iodide solutions using a potentiostatic sweep technique. The rate of dissolution is almost unaffected by the halide at low concentrations due to the presence of a prepassive film. At higher halide concentrations the prepassive film is removed and active dissolution occurs. The reaction is first order in Br^?, zero order in I^? and independent of pH for pH < 2. The Tafel slope is 82 mV, in accord with earlier work in chloride solutions.