Alpha-linoleic acid (ALA) as a corrosion inhibitor for XC48 steel in H2SO4 medium: an experimental and computational study

• C. Merimi¹, K. Zaidi¹, B. Hammouti^1,2, L. Guo^3,4, S. Kaya⁵, H. Elmsellem¹, A. Aouniti¹, M. Bouklah¹ and R. Touzani¹

¹ University Mohammed Premier, Faculty of Sciences, Laboratory: Applied Chemistry and Environment (LCAE), Department of chemistry, BP 717, 60000 Oujda, Morocco
² Centre de Recherche, Ecole des Hautes Etudes d’Ingenierie EHEIO, Oujda, Morocco
³ School of Material and Chemical Engineering, Tongren University, Tongren 554300, PR China
⁴ School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, PR China
⁵ Sivas Cumhuriyet University, Health Services Vocational School, Department of Pharmacy, 58140, Sivas, Turkey

Abstract: Iron and steel materials are extensively used in many industries due to low cost and availability. We suggested alpha-linolenic acid (ALA) to slow down the corrosion of XC48 steel in H₂SO₄ solution. We chose ALA because it comprises a carboxylic group and an aliphatic chain containing 17 carbons with three double bonds. This work was conducted by electrochemical measurements (stationary current–voltage curves) and gravimetric measurements (weight loss method) at various temperatures (298–348 K). The findings show that this agent acts as a strong inhibitor in a large concentration range. The inhibition effect is 92% at a concentration of 5·10^–3 M. Adsorption and activation parameters were also evaluated. Conceptual Density Functional Theory calculations and the results of the Molecular Dynamic Simulation Approach are in good agreement with the experimental observations.

Keywords: alpha-linolenic acid, carbon steel, corrosion, protection, inhibitors, H2SO4 solution

Int. J. Corros. Scale Inhib., 2022, 11, no. 4, 1456-1482
doi: 10.17675/2305-6894-2022-11-4-3

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