Activité inhibitrice d’un composé imine polydentate sur la corrosion de l’acier au Carbone dans un milieu agressif : Étude expérimentale et théorique

Abstract

This work focuses on the study of the corrosion inhibition of XC48 steel in a 1 M hydrochloric acid solution by DAB2OH, a Schiff base, at various temperatures. The inhibitory efficacy of this base was evaluated using experimental methodsincluding gravimetric measurements, polarization curves, contact angle measurements, and surface analysis by scanning electron microscopy (SEM). In addition, theoretical calculations based on density functional theory (DFT) were performed to explore the electronic properties of the inhibitor and its interaction with the metal surface. Gravimetric measurements showed that DAB₂OH exhibits excellent inhibitory efficacy, reaching a maximum value of 92.35% after 24 hours of immersion at 25 °C. This performance is attributed to the adsorption of inhibitor molecules onto the steel surface and the formation of a protective layer that reduces the corrosive effects of the environment. The results of the analysis of the influence of temperature, using thermodynamic parameters, confirmed that increasing the temperature decreases the effectiveness of the inhibitor on the metallic surface