The effect of halide ions on nickel corrosion in perchloric acid solutions; pp. 184–192

Abstract

A comparative study of the effect of halide anions on the corrosion of mechanically and chemically polished nickel in perchloric acid solutions was carried out. Perchloric acid was chosen for the reference as perchlorate anion is one of the least adsorbed anions on nickel and this property allows examining adsorption of halogenide anions down to very low concentrations. It was established that in 0.1 M perchloric acid so low concentration of halogenides as 1 x 10–5 M has significant influence on nickel corrosion. Adsorption of halide ions depends remarkably on the energetic properties of the nickel surface. This effect was the most pronounced in the case of chloride ions, which essentially accelerated the corrosion of mechanically polished electrodes but had only a weak effect on chemically polished electrodes.