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Potentiodynamic and cyclic voltammetric studies were carried out on nickel in borate buffered saline (pH = 8.49). The anodic excursion spans of nickel in borate buffer solution do not involve active/passive transition. The passive film starts to break down in the presence of Cl-ions, which causes pitting damage. The data reveal that the increasing Cl −  concentration and solution temperature shifts the  E  pit  to the active direction while the increasing in scan rate shifts the  E  pit  to the positive direction. The pitting potential ( E  pit ) shifted in a positive direction when increasing concentrations of Wo 4  −2  and MoO 4  −2  anions were added to a borate buffer solution containing Cl −  ions, showing that the additional anions had an inhibitory influence on the pitting corrosion. While the NO 3  −  anion is ineffectual as an inhibitor and rather speeds up pitting corrosion, the NO 2  −  anion has a slight inhibitory impact on pitting corrosion.

The role of different inorganic anions on passive film durability for nickel against chloride ions pitting corrosion in borate buffered solution