The Influence of the Cadmium Complex of Nitrilo-Tris-Methylenephosphonic Acid and Electrochemical Behavior of Low-Carbon Steel in Neutral Aqueous Media Containing Chloride Ions

I. S. Kazantseva; Казанцева И. С.; F. F. Chausov; Чаусов Ф. Ф.; N. V. Lomova; Ломова Н. В.; V. L. Vorobyov; Воробьев В. Л.

doi:10.31857/S0044185623700389

The Influence of the Cadmium Complex of Nitrilo-Tris-Methylenephosphonic Acid and Electrochemical Behavior of Low-Carbon Steel in Neutral Aqueous Media Containing Chloride Ions

Authors: Kazantseva I.S.¹, Chausov F.F.², Lomova N.V.², Vorobyov V.L.¹
Affiliations:
1. Federal State Budgetary Institution of Science “Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences”, 426067, Izhevsk, Russia
2. Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences, Izhevsk, 426000 Russia
Issue: Vol 59, No 3 (2023)
Pages: 330-340
Section: ФИЗИКО-ХИМИЧЕСКИЕ ПРОБЛЕМЫ ЗАЩИТЫ МАТЕРИАЛОВ
URL: https://cardiosomatics.ru/0044-1856/article/view/663890
DOI: https://doi.org/10.31857/S0044185623700389
EDN: https://elibrary.ru/SFQBTB
ID: 663890

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Abstract

The potentiodynamic method was used to study the influence of the cadmium complex of nitrilo-tris-methylenephosphonic acid Na4[Cd(H2O)N(CH2PO3)3]·7H2O on the corrosion-electrochemical behavior of low-carbon steel in neutral aqueous media in the presence of Cl ions-. The composition and structure of passive films formed at different potentials and composition of the medium were studied by X-ray photoelectron spectroscopy with layer-by-layer etching. When the content of Cl– ions up to 20 mg/dm3 Na4[Cd(H2O)N(CH2PO3)3]·7H2O at a concentration of 0.025–1.00 g/dm3 acts as a corrosion inhibitor, reducing the current density of anodic dissolution of the metal, and, at a concentration of more than 1.00 g/dm3, encouraging corrosion. The minimum corrosion rate is achieved at a concentration of Na4[Cd(H2O)N(CH2PO3)3]·7H2O 0.15 g/dm3 regardless of the concentration of Cl– ions. At Cl– ion concentrations of 50 mg/dm3 and more, Na4[Cd(H2O)N(CH2PO3)3]·7H2O is ineffective as a corrosion inhibitor.

Keywords

corrosion inhibitors, mild steel, passive films, cadmium complex nitrilo-tris-methylenephosphonic acid, potentiodynamic method, XPS

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