Inhibiting effect of the essential oil of the Schinus Terebinthifolius fruits on corrosion of E24 carbon steel in 1 M HCl

• N. Ouadghiri^1,2, S. Ksama¹, M. Benmessaoud¹, M. Damej¹, K. Tassaoui¹, O. Belhoussaine³, H. Harhar³, A. El Yadini³ and S. El hajjaji²

¹ Energy, Materials and Sustainable Development Team, Higher School of Technology Salé, Mohammed V University in Rabat 8007, Morocco
² Laboratory of Spectroscopy, Molecular Modelling Materials, Nanomaterial Water and Environment – CERNE2D, Faculty of Sciences, Mohammed V University in Rabat, Morocco
³ Materials, Nanotechnology and Environment Laboratory (LMNE), Faculty of Sciences, Mohammed V University of Rabat, BP 1014 Rabat, Morocco

Abstract: This study explores the inhibitory properties of Schinus Terebinthifolius fruits essential oil (STFEO) on the corrosion of E24 carbon steel in a 1 M hydrochloric acid solution. Essential oil extracted from the fruits of Schinus Terebinthifolius (STF), underwent testing at various concentrations and temperatures through a range of methods, including utilizing weight loss measurements and electrochemical techniques, adsorption isotherms, and scanning electron microscopy (SEM). An inhibition efficiency of 90.64%, 88.36%, and 86.33% was attained when employing 1 g/L of STFEO in weight loss assessments, polarization experiments, and EIS evaluations, respectively. Observations indicated that elevating the inhibitor concentration improved its inhibitory effectiveness while raising the temperature diminished its inhibitory performance. The findings indicate that STFEO functions as a mixed-type inhibitor with a preference for the anodic effect. The STFEO adsorption adhered to the Langmuir model, and the free energy of adsorption data registered a value of –33.70 kJ/mol, signifying a physical and chemical adsorption process. Examination of the metal surface of E24 steel via SEM/EDS reveals the development of an inhibitory film acting as a protective barrier against corrosion, in a 1 M HCl acid solution.

Keywords: Schinus Terebinthifolius, carbon steel, essential oil, corrosion, corrosion inhibition, hydrochloric acid

Int. J. Corros. Scale Inhib., 2024, 13, no. 3, 1831-1850
doi: 10.17675/2305-6894-2024-13-3-28

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