Adsorption Isotherm, Thermodynamic and Electrochemical Studies of Lawsonia Inermis Leaf Extract as a Sustainable Corrosion Inhibitor of Mild Steel in Acid Medium
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Weight loss method, polarization techniques, and electrochemical impedance spectroscopy (EIS) experi- ments were used to evaluate natural corrosion prevention and adsorption capacities of Lawsonia inermis (Henna) leaf extract on mild steel in 1 M HCl medium. Effect of temperature on mild steel corrosion behavior was studied at a temperature range of 303K–33K. The efficiency of Henna leaf extract in inhib- iting corrosion of mild steel increased with increasing concentration but decreased with increasing tem- perature. Activation and free energies for inhibition reactions support a mechanism of physical adsorption. The adsorption of henna extract on mild steel surface was endothermic and spontaneous, consistent with Langmuir adsorption isotherm. Polarization and EIS measurements indicated that henna extract could act as a mixed type inhibitor. Henna leaf extract as a protective coating was examined using Fourier transform infrared spectroscopy and scanning electron microscopy. Maximum inhibition efficiency at 1 M HCl was (66%) obtained when inhibitor concentration was 400 ppm.
Abstract
Weight loss method, polarization techniques, and electrochemical impedance spectroscopy (EIS) experi- ments were used to evaluate natural corrosion prevention and adsorption capacities of Lawsonia inermis (Henna) leaf extract on mild steel in 1 M HCl medium. Effect of temperature on mild steel corrosion behavior was studied at a temperature range of 303K–33K. The efficiency of Henna leaf extract in inhib- iting corrosion of mild steel increased with increasing concentration but decreased with increasing tem- perature. Activation and free energies for inhibition reactions support a mechanism of physical adsorption. The adsorption of henna extract on mild steel surface was endothermic and spontaneous, consistent with Langmuir adsorption isotherm. Polarization and EIS measurements indicated that henna extract could act as a mixed type inhibitor. Henna leaf extract as a protective coating was examined using Fourier transform infrared spectroscopy and scanning electron microscopy. Maximum inhibition efficiency at 1 M HCl was (66%) obtained when inhibitor concentration was 400 ppm.