Anti-corrosive properties of two new green heterocyclic azole derivatives on C38 steel in 1 M (HCl) medium, experimental and theoretical study
Omar Id El Mouden, M.E. Belghiti, K. Mizeb, Mohamed El Ghozlani, Abdelmalek Matine, A. Batah, L. Bammou, El Mostapha Rakib, Abdellah Zeroual, M. Belkhaouda, Saïd Belaaouad, H. Elalaoui-Elabdallaoui
Abstract
In 1.0 M HCl media, two newly component namely (1-Allyl-6-nitro-1H-indazole (1a) & 1-Ethyl-5-nitro-1H-benzimidazole-2-thiol (2b)) were used to inhibit corrosion of C38-steel. The activity inhibitor (IE%) of 1a & 2b was investigated using electrochemical, i.e., potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) & weight loss. The experimental results revealed that 1a & 2b successfully inhibited the C38- steel corrosion in C = 1.0 M// HCl solution. The IE(%) values produced by the three approaches were nearly identical, with the maximum value (97.5 %) obtained at T = 298 k of 2b.The high temperatures showed a negative effect on the corrosion inhibition efficiency of the tested inhibitor. Polarization methods revealed that the inhibitor behavior is of a mixed nature. The adsorption isotherm was also studied, and it was observed that 1a & 2b adsorbs on the C38- steel surface in agreement with the Langmuir isotherm, which indicated that both molecules adsorb on the metal’s surface, producing a protective layer that inhibits corrosion. The computational results demonstrate that the inhibitor formed a protective barrier against acid attack, preventing carbon steel from corrosion; these findings backed with the experimental findings. In addition, the regioselectivities experimentally observed were interpreted by Parr functions.