Abstract
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 MoO4-2 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 NO3- anion is ineffectual as an inhibitor and rather speeds up pitting corrosion, the NO2- anion has a slight inhibitory impact on pitting corrosion.