Etude électrochimique et quantique des propriétés inhibitrices de nouveaux composés hétérocycliques pour l’acier en milieu agressif

Abstract

The study of the corrosion inhibition of steel in 1M HCl acid medium by two series of heterocyclic compounds of Schiff bases (H2L-H, H2L-Br) et (L1, L2) was carried out using different techniques: gravimetry, polarization curves and electrochemical impedance spectroscopy (EIS). The influence of concentration, immersion time, temperature and synergy were examined and the hydrodynamic study was carried out. The morphological analysis of the metal surface was interpreted by atomic force microscopy (AFM), scanning electron microscopy (SEM) coupled to EDS (energy dispersive X-ray spectrometry) and the adsorption mode of these inhibitors on the metal surface has been highlighted by assigning it the appropriate isotherm and determining the corresponding thermodynamic quantities. The adsorption of the inhibitors on the metal surface was confirmed by the spectroscopic characterization of the protective layer. A correlation between molecular structures and inhibitory activity was performed using the DFT quantum study (density functional theory) and molecular dynamic simulations (MDS).