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Electrochemical Corrosion Behavior of Mild Steel in HCl and H2SO4 Solutions in Presence of Loquat Leaf Extract

Abstract

The electrochemical corrosion behavior of mild steel in 0.5 M HCl and 0.5M H2SO4 solutions in presence of loquat, Eriobotrya japonica (EB), leaf extract was studied using Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy and Fourier Infrared Spectroscopy (FTIR) measurements. Tafel polarization studies revealed that EB acts as mixed type in hydrochloric and anodic type inhibitor in sulphuric acid solution. The impedance response consisted of characteristic depressed semicircles clarifying that the corrosion process occurs under charge transfer control. The inhibition efficiency of the leaf extract increased with increasing the concentration and decreased with temperature. The results showed that EB is more efficient in 0.5 M HCl than in 0.5M H2SO4 solutions. Theoretical fitting of Temkin isotherm was tested to clarify the nature of adsorption on mild steel surface. Thermodynamic parameters indicated that the inhibition of corrosion of mild steel by EB leaf extract occurred by physical adsorption mechanism.

Author(s)

Abdel Gaber A.M.

Coauthor(s)

Younes G.O., Hijazi K.M.

Journal/Conference Information

International Journal of Electrochemical Science,2015, (10), 4366 - 4380