Abstract
The effect of the Na4[CuN(CH2PO3)3]·13H2O complex compound with a chelate structure on the corrosion-electrochemical behavior of 20# steel in a borate buffer solution at pH 7.4 and natural aeration was studied using the potentiodynamic method and methods of X-ray photoelectron spectroscopy and surface scanning electron microscopy with microanalysis. It was established that in the concentration range of 0.2–1.0 mM the complex under study inhibits the anodic dissolution of the metal and drives it at higher concentrations. In terms of its effect on the corrosion-electrochemical behavior of steel, the Na4[CuN(CH2PO3)3]·13H2O complex differs significantly from the previously studied complexes Na4[ZnN(CH2PO3)3]·13H2O and Na4[Cd(H2O)N(CH2PO3)3]·7H2O. In the potential range –0.66…–0.05 V relative to the Ag,AgCl|KCl-electrode (SSCE) a layer of metallic copper is generated on the surface in the form of nano-sized crystals, shielding the surface of the steel. In the potential range of 0.05–0.13 V (SSCE), metallic copper is oxidized, and with a further increase in the potential, a layer of mixed iron and copper oxides is formed.
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ACKNOWLEDGMENTS
The work was carried out using the equipment of the Center for Collective Use of the Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences “Surface and New Materials.”
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The work was carried out in accordance with the scientific research plan no. 121030100002-0 of the Ministry of Science and Higher Education of the Russian Federation. XPS studies were carried out with the support of the Ministry of Science and Higher Education of Russia within the framework of agreement no. 075-15-2021-1351 regarding the development of the X-ray photoelectron spectroscopy method.
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I.A. Zhilin and F.F. Chausov proposed a statement of the problem and developed a research program, prepared initial reagents and samples, and conducted electrochemical studies; N.V. Lomova and N.Yu. Isupov carried out X-ray photoelectron spectroscopic analysis of the surface of the samples; I.S. Kazantseva interpreted the results of electrochemical studies; I.K. Averkiev conducted electron microscopic studies of the samples.
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Translated from Zhurnal Prikladnoi Khimii, No. 2, pp. 184–199, February, 2023 https://doi.org/10.31857/S004446182302007X
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Zhilin, I.A., Chausov, F.F., Lomova, N.V. et al. Impact of the Chelate Complex of Nitrilotris(methylenephosphonic Acid) with Copper on the Corrosion-Electrochemical Behavior of Carbon Steel in an Aqueous Medium. Russ J Appl Chem 96, 176–189 (2023). https://doi.org/10.1134/S1070427223020089
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DOI: https://doi.org/10.1134/S1070427223020089