Using the essential oil of the plant Illicium verum as an ecological corrosion inhibitor for stainless steel in an HCl solution

• B. Outemsaa¹, M. Ouakki^2,3, Z. Rouifi⁴, H. Chahmout², T. Laabaissi⁴, A. Ech-chebab⁵, A. Oubihi¹, R. Ihamdan², N. Khouya², M. Cherkaoui^2,3 and M. Ouhssine¹

¹ Laboratory of Natural Resource and Sustainable Development, Department of Biology, Faculty of Science, Ibn Tofaïl University, PO Box 133, 14000, Kenitra, Morocco
² Laboratory of Organic Chemistry, catalysis and Environment, Faculty of Sciences, Ibn Tofaïl University, PO Box 133, 14000, Kenitra, Morocco
³ National Higher School of Chemistry (NHSC), Ibn Tofaïl University, PO Box 133, 14000, Kenitra, Morocco
⁴ Laboratory of Separation Processes, Faculty of Science, University Ibn Tofail, PO Box 133, 14000, Kenitra, Morocco
⁵ Laboratory of Advanced Materials and Process Engineering, Faculty of Sciences, Ibn Tofaïl University, PO Box 133, 14000, Kenitra, Morocco

Abstract: In this study, we explored the potential of Illicium verum (IV) essential oil as an eco-friendly corrosion inhibitor for stainless steel in molar hydrochloric acid. The effectiveness of the inhibitor was evaluated through electrochemical methods, including potentiodynamic polarization (PDP) and impedance spectroscopy (EIS), while the surface of the steel was analyzed using a scanning electron microscope (SEM). Our results indicate that Illicium verum essential oil exhibits a significant inhibitory effect on stainless steel corrosion, with a maximum efficiency of 91.4% observed at a concentration of 2.0 g/L. Furthermore, the polarization study revealed that the essential oil acts as a mixed type inhibitor on the metal surface. The EIS results showed an increase in polarization resistance (R_p) while the double layer capacitance (C_dl) decreases with an increase in Illicium verum (IV) concentration. The obtained results also showed that the inhibition efficiency decreased with an increase in the temperature, and the efficiencies of 91, 88, 85, and 83% were obtained at 298, 308, 318, and 328 K, respectively, while the thermodynamic analysis indicated that it is adsorbed according to the Langmuir isotherm.

Keywords: Illicium verum, essential oil, ecological inhibitor, stainless steel, HCl, SEM analysis

Int. J. Corros. Scale Inhib., 2023, 12, no. 4, 2046-2065
doi: 10.17675/2305-6894-2023-12-4-32

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