Spectroscopic Investigations of Physicochemical Interactions on Mild Steel in an Acidic Medium by Environmentally Friendly Green Inhibitors
作者： Pitchai Sakunthala , Shanmuga Sundaram Vivekananthan , Mayakrishnan Gopiraman , Nagarajan Sulochana , Alex Ramani Vincent
DOI: 10.1007/S11743-012-1405-5
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摘要: The influences of Polycarpaea corymbosa (PC) and Desmodium triflorum (DT) leaf extracts on the corrosion behavior mild steel (MS) in 1.0 M HCl was investigated by weight loss, potentiodynamic polarization electrochemical impedance spectroscopy (EIS) measurements. effect temperature MS with addition plant studied range 300 K–320 ± 1 K. results revealed that PC DT were excellent green inhibitors inhibition efficiencies obtained from loss experiments good agreement. Inhibition up to 91.78 % for 92.99 % obtained. Potentiodynamic studies both behaved as mixed-type inhibitors. Adsorption these surface found obey Langmuir adsorption isotherm. thermodynamic parameter values free energy (∆G ads) enthalpy (∆H each inhibitor adsorbed via chemisorption physisorption mechanisms. mechanism supported FT–IR, UV–Visible, WAXD SEM–EDS.
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