Use of the ethanolic extract from Eriobotrya Japonica seeds as a corrosion inhibitor of C38 in a 1 M HCl medium

• K. Bouiti¹, H.A. Al-sharabi^1,2, F. Bouhlal¹, N. Labjar¹, A. Dahrouch³, M. El Mahi¹, E.M. Lotfi¹, B. El Otmani¹, G.A. Benabdallah¹ and S. El Hajjaji³

¹ Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment. CERNE2D, ENSAM, Mohammed V University in Rabat, Morocco
² Laboratory of chemistry, Jamal Abdulnasser High School, Ministry of Education, Yemen
³ Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERNE2D, Faculty of Sciences, Mohammed V University in Rabat, Morocco

Abstract: This study involves the use of Eriobotrya Japonica seed extract as a corrosion inhibitor prepared by cold maceration with ethanol as solvent in a hydrochloric medium 1 M, the electrochemical tests are carried out in the absence and presence of the inhibitor by varying the concentration and immersion time of the C38 steel used in the electrolytic medium. The results of the potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy techniques (EIS) indicate a mixed inhibition with an efficiency of 80% at 2.5 g/l to reach a maximum of 96% after 4 h of immersion for 2 g/l. According to the parameters obtained, the most adequate model is the Langmuir isotherm and the adsorption on the surface occurs by a spontaneous physisorption process that minimizes the corrosion reactions through the formation of a protective layer with the molecules of Eriobotrya Japonica. A gas chromatography-mass spectrometry (GC-MS) study of the extract and the scanning electron microscope associated with the energy-dispersive X-ray spectroscopy (SEM/EDS) study of the metal surface were performed to better understand this impact. The results of the GC-MS analysis revealed the existence of various chemicals that could be responsible for the corrosion inhibition properties of the inhibitor.

Keywords: corrosion, Eriobotrya Japonica, extract, inhibitor

Int. J. Corros. Scale Inhib., 2022, 11, no. 3, 1319-1334
doi: 10.17675/2305-6894-2022-11-3-24

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