Evaluation of the inhibitory effect of some derivatives of salts of long-chain carboxylic acids in relation to pitting corrosion of reinforcing steel in concrete

Keywords: Reinforcing steel, Reinforced concrete, Corrosion inhibitors, Chlorides, Long-chain salts carboxylic acids

Abstract

     Derivatives of salts of long chain carboxylic acids and dimethylaminopropylamine, including those similar in composition to vegetable oils were synthesized. The structure of the molecules of new substances was reliably confirmed using physical methods of IR-Fourier spectroscopy, NMR spectroscopy, and HPLC.
     The inhibitory effect of the synthesized substances on 35GS grade reinforcing steel was assessed using voltammetry. Experiments were carried out in an aqueous extract from a mortar, simulating the concrete pore solution, in the presence of chlorides as activators of pitting corrosion, as well as in samples of fine-grained concrete with periodic immersion in a chloride solution. It was found that 3-(dimethylamino)propyl-1-ammonium stearate did not exhibit an inhibitory effect. The introduction of salts of fatty acids of coconut and sunflower oils increased the anti-corrosion properties. The degree of protection was 40-44% in aqueous solutions and 30-32% for concrete samples.
     The time before the onset of corrosion in concrete samples was found to increase by 1.75 times compared to the control composition without additives

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Author Biographies

Oleg A. Kozaderov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Dr. Sci. (Chem.), Docent, Head of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Dmitry S. Shevtsov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Researcher of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Mikhail A. Potapov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Researcher of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Iliya D. Zartsyn, Voronezh State University, 1 Universitetskaya pl., Voronezh, 394018, Russian Federation

Dr. Sci. (Chem.), Professor of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Svetlana N. Grushevskaya, Voronezh State University, 1 Universitetskaya pl., Voronezh, 394018, Russian Federation

Cand. Sci. (Chem.), Docent of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Alexey A. Kruzhilin, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Cand. Sci. (Chem.), Researcher of the Laboratory of Organic Additives for the Processes of Chemical and Electrochemical Deposition of Metals and Alloys Used in the Electronics Industry, Voronezh State University (Voronezh, Russian Federation)

Evgeniia A. Ilina, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Graduate Student of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Kirill A. Tkachenko, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Student of the Department of Physical Chemistry, Voronezh State University (Voronezh, Russian Federation)

Khidmet S. Shikhalie, Voronezh State University, 1 Universitetskaya pl., Voronezh, 394018, Russian Federation

Dr. Sci. (Chem.), Professor, Head of the Department of Organic Chemistry, Voronezh State University (Voronezh, Russian Federation)

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Published
2023-09-12
How to Cite
Kozaderov, O. A., Shevtsov, D. S., Potapov, M. A., Zartsyn, I. D., Grushevskaya, S. N., Kruzhilin, A. A., Ilina, E. A., Tkachenko, K. A., & Shikhalie, K. S. (2023). Evaluation of the inhibitory effect of some derivatives of salts of long-chain carboxylic acids in relation to pitting corrosion of reinforcing steel in concrete. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 25(3), 445-453. https://doi.org/10.17308/kcmf.2023.25/11396
Section
Original articles