Enhancement of steel passivation by triazoles in neutral chloride solutions using copper sulphate microadditives

Andreeva, N.P.; Kuznetsov, Y.I.; Agafonkina, M.O.; Kuznetsov, I.A.

Авторы: Andreeva N.P., Kuznetsov Yu I., Agafonkina M.O., Kuznetsov I.A.
Журнал: International Journal of Corrosion and Scale Inhibition
Том: 12
Номер: 4
Год издания: 2023
Издательство: Некоммерческое партнерство коррозионистов "Вакор"
Местоположение издательства: Москва
Первая страница: 2080
Последняя страница: 2091
DOI: 10.17675/2305-6894-2023-12-4-34
Аннотация: The influence of microadditives of copper cations (Cu2+) on the adsorption and protective properties of layers formed by 1,2,3-benzotriazole (BTA) and 5-chloro-1,2,3-benzotriazole (5-chloroBTA) on mild steel in a neutral borate buffer solution with a pH of 7.4 has been studied. Introduction of an electron-withdrawing –Cl substituent into the molecule of BTA improves its adsorbability on mild steel and copper compared to unsubstituted azole. Surface modification of mild steel by adsorption of copper cations added to neutral aqueous solution in micro quantities (1.5 μmol/L) increases the free energy of adsorption of BTA and facilitates the passivation of steel. XPS analysis showed that during adsorption on the steel surface, Cu2+ cations reduce to Cu+, which replaces Fe cations in the top layer of FeOOH at a ratio of Fe/Cu=1/(0.2–0.6). This contributes to a more lasting retention of a monolayer of 5-chloro-BTA and improves its protective properties. On the surface of iron oxide, 5-chloro-BTA molecules form a monomolecular layer in which the planes of molecules are arranged vertically to the surface due to the formation of coordination bonds of metal cations with nitrogen lone pairs. Copper cations contribute to the formation of a self-organizing BTA or layer with a less defective structure.
Добавил в систему: Агафонкина Марина Олеговна

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Enhancement of steel passivation by triazoles in neutral chloride solutions using copper sulphate microadditivesстатья

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