Evaluation of Zataria multiflora Essential Oil as a Green Corrosion Inhibitor for Mild Steel in HCl Solution

In the present study, the corrosion inhibition performance of Zataria multiflora essential oil as a green inhibitor for steel in ۱ M hydrochloric acid solution was evaluated. Weight loss measurements, electrochemical impedance spectroscopy (EIS), polarization, and scanning electron microscopy (SEM) analyses were employed. The weight loss results demonstrated a significant reduction in corrosion rate with increasing inhibitor concentration, achieving maximum inhibition efficiency at ۴۰۰ mg/L. EIS analysis revealed a substantial increase in polarization resistance from ۱۶۰ to ۱۷۸۲ Ω.cm² in the presence of the inhibitor, indicating the formation of a stable and protective adsorbed film on the steel surface. Potentiodynamic polarization results showed that the corrosion current density decreased markedly from ۹۵.۴ to ۹.۷ µA/cm². Furtheremore, thermodynamic studies shows that adsorption process followed the Langmuir isotherm. SEM observations further supported the electrochemical results by revealing a smoother and less damaged surface in the presence of the inhibitor.

کلیدواژه ها:

Steel Corrosion ، Zataria multiflora essential oil ، Green Inhibitor ، Adsorption Isotherm ، خوردگی فولاد ، اسانس آویشن شیرازی ، بازدارنده سبز ، ایزوترم جذب