Electrochemical impedance spectroscopy study on corrosion inhibition of benzyltriethylammonium chloride

Electrochemical Impedance Spectroscopy (EIS) was employed to study the corrosion inhibition behavior of benzyltriethylammonium chloride (BTC) for carbon steel corrosion.The inhibition efficiency was investigated in 1.0 M HCl solution at room temperature (25 o C) by varying the BTC concentration.EIS results indicated that the double layer capacitance of electrolyte/carbon steel interface decreases with the increasing of BTC concentration and consequently enhances the polarization resistance of equivalence Randles circuit.The results indicated that inhibition efficiency of as high as 65% could be achieved when 10mM BTC was present in 1.0 M HCl solution as compared to inhibitor-free solution.The inhibition process of BTC on the carbon steel corrosion was found to obey Langmuir adsorption isotherm.This study revealed that BTC is suitable to be used as a corrosion inhibitor in acid media.