Inhibitive behavior of Ambrosia Maritima extract as an eco-friendly corrosion inhibitor for carbon steel in 1M HCI

Abstract

The inhibition effect of Ambrosia Maritima, which also named after (Damsissa) extract, towards the corrosion of carbon steel in 1M HCl solution was investigated utilizing potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) methods. The process of adsorption obeyed Langmuir adsorption isotherm. Damsissa extract was found to act as a mixed-type in 1M HCl. The computed adsorption thermodynamic parameters demonstrated that the adsorption was a spontaneous, endothermic process accompanied by an increase in the entropy. The maximum value of the inhibition approached 92.6% within the presence of 300 ppm Damsissa extract utilizing Tafel polarization procedure. The results obtained from the various electrochemical processes were in a great agreement. The inhibition of the extract was assumed to occur through the adsorption of active ingredients on the metal surface. Morphology of the surface was analyzed utilizing scanning electron microscopy (SEM), Fourier transforms infrared (FTIR) and atomic force microscopy (AFM) which confirmed the presence of a protective film of extract molecule on carbon steel 1018 surface.