Abstract
The corrosion behavior of the nickel electrode in NaOH solution was investigated using open circuit potential measurements, galvanostatic, and potentiostatic polarization techniques. The effect of open circuit potential, current densities, NaOH concentration, Cl- anions, and some natural oils e.g. sesame oil, water cress oil, wheat germ oil and almond oil as an inhibitors for corrosion of the nickel in1 x10-2 M NaOH solution was studied. The percentage inhibition efficiency was found to increase with increasing concentration of these oils. The inhibitive action of these oils was explained due to the adsorption on the Ni surface, making barrier to mass and charge transfer, The adsorption process follows Freundlish isotherm. The inhibition efficiency decreases in the order: sesame oil> water cress oil > wheat germ oil > almond oil.