Synthèse caractérisation et comportement électrochimique de monomère de bases de Schiff dérivées de composés azotés et carbonyles et de leurs complexes métalliques

Abstract

In this work we have synthesized four new Schiff bases by condensation of 4,4-diaminobiphenyl with benzyl, the 3 carboxaldehyde thiophene, the 2carbaxaldehyde furan and déhydroacitique acid. The molecular structures of the synthesized compounds have been determined using the spectroscopic methods UV-Vis, IR, 1H, 13C NMR and DRX. Their inhibition effect towards corrosion of steel in hydrochloric acid was investigated using weight loss, polarization curves and electrochemical impedance spectroscopy methods. The obtained results indicate that the studied compounds are efficient mixed-type inhibitors and their inhibition efficiencies increased with increasing inhibitors concentrations. The adsorption of the inhibitors molecules on the carbon steel surface follows Langmuir isotherm and their thermodynamic parameters are obtained. The morphologies of the carbon steel surfaces after exposing in electrolytic solutions were examined by atomic force microscopy (AFM). The quantum chemical parameters were calculated employing the density functional method (DFT). Finally the interaction between inhibitor and Fe (100) surface are performed by molecular dynamic simulations.