ELECTROCHEMICAL AND CMT MEASUREMENTS OF THE ANOMALOUS DISSOLUTION OF NICKEL IN SOLUTIONS CONTAINING OXYGEN

In addition to single nickel crystals also nickel samples produced by dc and pr (pulse-reversal) plating were examined. As previously report ed the true rate of dissolution of nickel in solutions containing oxyg en was found to be as much as three times the electrochemical rate at the corrosion potential. When passivation was approached (spontaneousl y or by anodic polarization) the true rate of dissolution approached t he rate of anodic reaction. During cathodic polarization there was sti ll a significant rate of dissolution. The true rate of dissolution was determined by CMT measurements (Corrosion Measurements by Titration). Electrochemical measurements (EC) indicating the rate of electrochemi cal reactions were made simultaneously. (C) 1997 Elsevier Science Ltd.