Corrosion inhibition performance of mild steel in HCl solution by new organic imidazopyridine-based inhibitors

초록

The current research involves the development and preparation of two novel, non-toxic imidazopyridine-based Schiff base inhibitors, IMP 01 and IMP 02, using simple, cost-effective, and environmentally friendly methods. Characterization of the two compounds was carried out using advanced analytical techniques such as NMR (1H and 13C), FT-IR spectroscopy and LC-MS chromatography. The effectiveness of IMP 01 and IMP 02 as corrosion inhibitors for mild steel in 1 M HCl solution was evaluated through electrochemical methods at various temperatures and concentrations. The results demonstrate that both inhibitors provide significant corrosion protection. The consistency between potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) measurements showed inhibition efficiencies of 96 % for IMP 01 and 85 % for IMP 02. Both inhibitors exhibited a mixed cathodic and anodic behavior, following the Langmuir adsorption model. Scanning Electron Microscopy (SEM) analysis of the steel surface revealed minimal degradation in the presence of IMP 01 and IMP 02, particularly with IMP 01. Additionally, theoretical studies, including density functional theory (DFT) and molecular dynamics (MD) simulations, supported the proposed inhibition mechanism.

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