Abstract
The main objective of this work was to study the inhibition of the corrosion of the Carbon steel, in hydrochloric acid solution medium (1 M), using Lavandula stoechas essential oil .The effect of oil of Lavandula stoechas as an eco-friendly inhibitor for carbon steel corrosion have been investigated in 1 M hydrochloric acid solution by polarization curves, electrochemical impedance spectroscopy (EIS) and gravimetric techniques. Lavandula stoechas oil efficiently inhibited the carbon steel corrosion. The highest value of inhibition efficiency is 83.5% obtained by potentiodynamic polarization and 84.35% by electrochemical impedance spectroscopy measurement at maximum concentration tested. The inhibition efficiency augmented with increase in anise oil concentration but reduced with growth in temperature. Polarization curves show that the tested oil may be considered as mixed type inhibitor and the inhibitor absorption on the carbon steel electrode obeys the Langmuir isotherm. The EIS results indicate that the changes in impedance parameters are related to the adsorption of Lavandula stoechas on the alloy surface.
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