, Aurangzeb Hasan

nitrophenyl)-1,3,4-oxadiazole-2-thiol (A2) were studied as inhibitors of nickel metal corrosion. The kinetic and thermodynamic parameters of corrosion were determined from polarization curves and impedance measurements. It was found that the nickel surface was protected from corrosion when the inhibitor concentration was increased in the corrosive medium. Electrochemical impedance spectroscopy, open circuit potential, and linear scan voltammetry results showed that the corrosion rate of Ni decreased in the presence of inhibitors in a 3.5 % NaCl solution, with the inhibition strength in the order A1 ˃ A2. EIS measurements showed that the charge transfer resistances of the nickel surface in 0.16 mM A1 and A2 were 144.2 and 119.3 kΩ cm2 in a 3.5 % NaCl solution, respectively. FESEM images showed that the surface was well protected against corrosion when the concentration of inhibitors was increased to 0.3 mM in the corrosive media