Use of lavandula pedunculata essential oil as a green corrosion inhibitor for mild steel in 1 m hydrochloric acid solution

The lavandula pedunculata essential oil (lpeo) was tested as corrosion inhibitor of mild steel in 1m hcl medium using the weight loss measurements,potentiodynamic polarization and electrochemical impedance (eis) methods. the analysis of essential oil from lavandula pedunculata essential oil was carried out by gas chromatography. the analysis of lavandula pedunculata essential oil showed that the major components were camphor (53.1%); 1.8-cineole (6.5 %) and camphene (6.1 %). in temperature of 303k,the inhibition efficiency increased with an increase in lpeo concentration,to attain 81% and 88 % at 3.0 g/l for methods of potentiodynamic polarization and electrochemical impedance (eis) respectively. the obtained results revealed that the tested inhibitor leads to a systematic reduction in the kinetics of steel corrosion processes. it was found that lpeo behaved as a mixed type inhibitor. electrochemical impedance spectroscopy (eis) measurements show that charge transfer resistance (rct) increases and double-layer capacitance (cdl) decreases in presence of inhibitor,suggesting the adsorption of the inhibitor molecules on the surface of mild steel. the studied process is found to be obeying to langmuir model. © 2017.