Etude de l’inhibition de la corrosion de l’acier au carbone (XC38) par l’extrait aqueux de plantes sahariennes dans le milieu acide chlorhydrique 1M.

Abstract

Preserving the environment has become a foremost challenge facing scientists. In this perspective, this thesis work aims to promote aqueous extract of the Saharans plants , Hammada Scoparia, Zygophyllum Alba L and Artemisia Herba Alba as a corrosion inhibitor of XC38 carbon steel in a solution of 1M HCl. The influence of concentration, immersion time and temperature on the corrosion processes of XC38 steel in 1M HCl medium in the presence of inhibitor was studied by means of gravimetric measurements. The mechanism of inhibition is monitored by an electrochemical method (polarization curves and electrochemical impedance spectroscopy). Following these tests, the corrosion rate was calculated for the different experimental conditions. The thermodynamic parameters and activations have been determined. This investigation is complemented by an analysis of the morphology of the metal surface using infrared spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersion spectrometry (EDS). ). The results proof the formation of protective film on carbon steel surface.