Abstract
Pitting corrosion of nickel and its alloys (Inconel 600 and Incoloy 800) in 0.1 M H2SO4 solution containing of NaCl was studied using cyclic voltammetry and potentiodynamic anodic polarization techniques. The integrated charge amounts Deltaq(a) in presence of Cl- ions was taken as a measure of pitting corrosion. The pitting potential was varied with Cl- ion concentrations according to an S-shaped curves. Addition of dihydrazide derivatives of malonic, succinic and adipic acid caused a shift of pitting potential in the noble direction accounting for increased resistance to pitting attack.