Electroanalytical and Kinetic Studies on PBIMOT, a Benzimidazole Motif of 1,3,4-Oxadiazole as a Powerful Corrosion Inhibitor for Mild Steel in Nitric Acid

The effect of benzimidazole bearing 1,3,4-oxadiazole derivative, 5-((2-propyl-1H-benzo[d]imidazol-1-yl)methyl)-1,3,4-oxadiazole-2-thiol (PBIMOT), on the corrosion of mild steel in 0.25 M HNO 3 solution was studied using electroanalytical techniques. The inhibitive mechanism, kinetics and adsorption properties of PBIMOT on the corrosion of mild steel in 0.25 M HNO 3 have been investigated. PBIMOT molecule showed good inhibition efficiency in nitric acid solution and inhibition efficiency increases with increasing concentration and which attains 94% at 200 ppm at 303 K and the same decreases with temperature further. The fitting of isotherm and kinetic models have been studied to understand the corrosion inhibition mechanism. Quantum chemical parameters were calculated and explained.