Synthesis, characterization and corrosion inhibition potential of newly benzimidazole derivatives: Combining theoretical and experimental study

Abstract

Three new heterocyclic benzimidazole derivatives and has been synthesized and characterized via different spectroscopic methods (1H, 13C NMR) and study their inhibitory properties of three benzimidazole derivatives, namely: 2- (2- (4-chlorophenyl) -1H-benzo [d] imidazol-1-yl) -N- (p-tolyl) acetamide (CBIN-1), 2- (2- (4-chlorophenyl) -1H) benzo [d] imidazol-1-yl) -N- (3,5-dimethylphenyl) acetamide (CBIN-2) and 2- (2- (4-chlorophenyl) -1H-benzo [d] imidazol-1-yl)) -N-phenylacetamide (CBIN-3) for carbon steel (CS) in 1 M HCl solution using electrochemical impedance spectroscopy, potentiodynamic polarization and weight loss measurements at 298 K. The experimental results show that the inhibition increases with the concentration and can reach a limit value of 95.0% for the inhibitorCBIN-2 at 10−3 M. The polarization curves show that the benzimidazole derivatives (CBIN-1, CBIN-2 and CBIN-3) are of mixed type. The increase in temperature may have a decrease in the inhibition efficacy of the compounds studied. In addition, the inhibitors obey the single layer adsorption isotherm of Langmuir. It is found that the experimental parameters confirmed those obtained by theoretical studies. Surface morphology using SEM coupled and UV–visible spectroscopy of the carbon steel treated was investigated and discussed.