Influence of Soybean (Glycine Max) Plant Extract on Corrosion of Aluminum in 1M HCl

Glycine Max Extract (G.M.E.) is used as a corrosion inhibitor for aluminum alloy in 1.0M HCl employing chemical (weight loss, WL) and electrochemical (Potentiodynamic polarization, PP, electrochemical frequency modulation, EFM and AC impedance, EIS techniques. The scanning electron microscope (SEM) was used to examine the surface morphology of Al alloy. The temperature effect on corrosion the rate in the presence of various concentrations was measured in the range of 298-318K by WL. PP curves demonstrate that G.M.E is a mixed type inhibitor. The corrosion efficiency improved by raising GM.E concentration and with improving temperature. Temkin’s isotherm was established to be the best isotherm to define the adsorption of the G.M.E. on the surface of Al alloy. The adsorption and activation parameters had calculated and discussed.