Efficiency of cadmium complex of nitrilo-tris-methylene phosphonic acid as an inhibitor of low-carbon steel corrosion in neutral iodide-containing aqueous media and peculiarities of formation of passivating films under these conditions

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Abstract

Influence of the cadmium complex of nitrilo-tris-methylene phosphonic acid Na4[Cd(H2O)N(CH2PO3)3]·7H2Oon the corrosion-electrochemical behavior of low-carbon steel in neutral iodide-containingaqueous media is studied by the potentiodynamic method. The compositionand structure of passivating films, spatial localization of the processesof interaction between the inhibitor and iron ions, accompanying processesand products of these interactions are studied by X-ray photoelectronspectroscopy with layer-by-layer etching. In the presence of 1.4 mmol/dm3of I–ions, Na4[Cd(H2O)N(CH2PO3)3]·7H2O reduces the current densityof anodic dissolution of the metal at the concentration 0.05–0.5g/dm3and stimulates corrosion at the concentration 1.0 g/dm3and higher, the optimal concentration of the inhibitor is0.2–0.5 g/dm3.

About the authors

I. S. Kazantseva

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

F. F. Chausov

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

V. L. Vorob’ev

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

N. V. Lomova

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: chaus@udman.ru
Izhevsk, 426067 Russia

N. Yu. Isupov

Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: chaus@udman.ru
Izhevsk, 426067 Russia

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