Mentha viridis oil as a green effective corrosion inhibitor for mild steel in 1 M HCl medium

• J. Lazrak¹, R. Salim¹, N. Arrousse¹, E. Ech-chihbi¹, F. El-Hajjaji¹, M. Taleb¹, A. Farah² and A. Ramzi¹

¹ Engineering Laboratory of Organometallic, Molecular Materials and Environment, Faculty of Science, University Sidi Mohamed Ben Abdellah, Po. Box 1796, Fez, Morocco
² Laboratory of Organic and Applied Chemistry, Faculty of Science and Technology, University Sidi Mohamed Ben Abdellah, Fez, Morocco

Abstract: The Mentha spicata var. viridis L. essential oil (MVEO) was analyzed by gas chromatography (GC) and gas chromatography–mass spectrometry GC/MS, which show that it consists mainly of carvone (45.83%), limonene (17.80%) and 1,8-cineole (9.02%). This oil was investigated as corrosion inhibitor for mild steel in 1 M HCl solution by the weight loss measurements, the potentiodynamic polarization (PP) and the electrochemical impedance spectroscopy (EIS) techniques. The results showed that MVEO is a good corrosion inhibitor with inhibition efficiency reached to 85% at concentration of 1 g/L. The polarization curves indicated that MVEO acted as mixed type inhibitor with anodic prevalence. The adsorption of the studied inhibitor on the mild steel surface obeys the Temkin isotherm and the E_a and ΔG⁰_ads values confirm a physical adsorption processes of this inhibitor. In addition, the structural and electronic properties of the major components of this oil were calculated using the density functional theory (DFT) at B3LYP/6-31G (d, p) level, in order to gain further insight into the adsorption behavior and inhibition mechanism for this plant.

Keywords: Mentha spicata var. viridis L., chromatography, EIS, corrosion inhibition, mild steel, Temkin isotherm, density functional theory

Int. J. Corros. Scale Inhib., 2020, 9, no. 4, 1580-1606 PDF (1 005 K)
doi: 10.17675/2305-6894-2020-9-4-25

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