The inhibitive action of leaf extract of Gundelia tournefortii (G. tournefortii) on mild steel corrosion in 2.0 M HCl and 1.0 M H2SO4 solutions was studied using weight loss measurement, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The inhibition efficiency was found to increase with increase of the inhibitor concentrations due to the adsorption of the inhibitor molecules on the metal surface. In addition, it was established the Langmuir adsorption isotherm fits well with the experimental data. The inhibition efficiency was found to be 93% and 90% at 150 ppm in 2.0 M HCl and 1.0 M H2SO4 respectively. Cathodic and anodic polarization curves show that G. tournefortii extract is a mixed-type inhibitor in both acidic media.EIS showed that the charge transfer controls the corrosion process. The effect of temperature on the inhibition efficiency was studied.Finally, inhibition efficiency of G. tournefortii extract was discussed in terms of adsorption and protective film formation.
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Soltani et al. (2015) studied this question.
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