Alkanolamine-modified derivatives of epoxidized sunflower oil: synthesis and evaluation of corrosion inhibition efficiency for reinforced concrete in chloride-containing media

• N.V. Stolpovskaya, A.A. Kruzhilin, D.S. Shevtsov, S.S. Chertov, O.A. Kozaderov, V.N. Semenov, M.Yu. Krysin and Kh.S. Shikhaliev

Voronezh State University, Universitetskaya pl. 1, Voronezh, 394018, Russia

Abstract: This study is devoted to the development of environmentally friendly corrosion inhibitors for steel reinforcement in concrete, based on derivatives of epoxidized sunflower oil modified with alkanolamines (monoethanolamine and diethanolamine). The synthesized derivatives derived from epoxidized sunflower oil and methyl esters of sunflower oil fatty acids were characterized by IR and NMR spectroscopy. It was confirmed that at an equimolar reagent ratio (1:1), the major process is the ring opening of oxirane rings, while concurrent transamidation of ester moieties occurs only in trace amounts; at a twofold excess of amine (2:1), both processes become comparable in their contributions. Analysis of electrochemical data, including polarization resistance and corrosion current density, showed that compounds obtained through simultaneous oxirane ring opening and transamidation with diethanolamine exhibited pronounced inhibitory efficiency (up to 62% and 55%, respectively) in model concrete pore solutions contaminated with chlorides. Concrete specimens containing these inhibitors are characterized by increased electrical resistivity and delayed corrosion initiation, with this effect being most pronounced at a concentration of 0.10 g·dm^–3. The obtained results highlight the prospects of using ethanolamine-modified epoxidized vegetable oil derivatives as functional materials for enhancing the durability of reinforced concrete structures in aggressive environments.

Keywords: corrosion inhibitors, reinforced concrete, epoxidized vegetable oils, alkanolamines, electrochemical impedance spectroscopy, chloride-induced corrosion

Int. J. Corros. Scale Inhib., 2026, 15, no. 3, 403-430
doi: 10.17675/2305-6894-2026-15-3-18

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