Anti-corrosion effect of Morrocan flax seeds oil as an eco-friendly inhibitor on mild steel in acidic media

• I. Najjari¹, A.M. Almehdi², F. Errachidi³, Y. Kandri Rodi¹, M. Ramdani⁴, І. Abdеl-Rahman², F. Ouazzani Chahdi¹, H. Steli⁵, L. El Ghadraoui³ and H. Elmsellem⁶

¹ Applied Organic Chemistry Laboratory, Faculty of Science and Technology of Fez, University of Sidi Mohamed ben Abdellah, P.O. Box 2202, Route d’Imouzzer, Fez, Morocco
² Dеpartmеnt of Chemistry, College of Scіеncеs, University of Sharjah, PO Box: 27272, UAЕ
³ Laboratory of Functional Ecology and Environment, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Route d’Imouzzer, Fez, Morocco
⁴ Laboratory of Water, Environment and Sustainable Development, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco
⁵ Mechanical & Energy Laboratory, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco
⁶ LC2AME, Department of Chemistry, Faculty of Sciences, Mohamed 1st University, P.O. Box 717, Oujda 60000, Morocco

Abstract: This study targets Moroccan flax seeds oil valorization in corrosion inhibition. This oil is very rich in fat (41%) where unsaturated fatty acids represent the majority (87%). Physico-chemical analysis shows that flax seeds oil having a density of 0.931, a refractive index of 1.476, an acid index of 0.85 mg KOH/g oil, a saponification index of 192.11 mg KOH/g oil, a peroxide index of 1.03 meq O₂/kg oil and an iodine index of 176.78 g/100 g oil. In this research, the effect of flax seeds oil on mild steel corrosion inhibition in 1 M HCl was analyzed using weight loss and impedance spectroscopy (EIS). From the results generated, optimum value (E%) of flax seeds oil was recorded as 94% and 92% at a concentration of 1 g/L by weight loss and EIS methods, respectively. Studies of impedance spectroscopy show that the inhibition mechanism is by the transfer of charges. The results also showed that the inhibitor flax seeds oil acts on the surface of the metal (mild steel) essentially by adsorption, leading to the formation of a protective film limiting the corrosion of mild steel.

Keywords: Linum usitatissimum, flax seeds oil, corrosion protection, mild steel, HCl solution, absorption

Int. J. Corros. Scale Inhib., 2020, 9, no. 4, 1402-1418 PDF (439 K)
doi: 10.17675/2305-6894-2020-9-4-13

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