Influence of lavandula dentata essential oil on the corrosion inhibition of carbon steel in 1 M HCl solution

Abstract

Within this study we are concerned by the corrosion inhibition of the essential oil of Lavandula Dentata (EOLD) in carbon steel in 1 M hydrochloric acid solution, the investigation was performed using gravimetric method, Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic polarization measurements. The results of electrochemical techniques and gravimetric measurements revealed that the EOLD tested as inhibitor leads to a systematic reduction in the kinetics of steel corrosion processes. Potentiodynamic polarization study has shown that EOLD is inhibitor of a cathodic type. The effect of temperature on the corrosion behavior of carbon steel in the presence and absence of EOLD was studied in the temperature range from 303 K to 333 K. The findings about Electrochemical Impedance Spectroscopy revealed a frequency distribution of the capacitance, simulated as constant phase element. Inhibition efficiencies, determined by potentiodynamic polarization, electrochemical impedance spectroscopy and weight loss methods, are in good agreement. The extracted of EOLD, by hydrodistillation, is analyzed by gas chromatography (GC), indeed, this technique of analysis has shown that its major component is: camphor (50.3%). The EOLD inhibitor adsorbed physically on the carbon steel surface obeys the Langmuir adsorption isotherm. The parameters of activation energy was fairly evaluated and discussed in this work.