Formation of passivating layers by 1,2,4-triazole derivatives on copper in aqueous solutions
- Авторлар: Kuznetsov Y.1, Shikhaliev K.2, Agafonkina M.1, Andreeva N.1, Semiletov A.1, Chirkunov A.1, Potapov A.2, Solov’ev V.1
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Мекемелер:
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Voronezh State University
- Шығарылым: Том 91, № 12 (2017)
- Беттер: 2458-2465
- Бөлім: Colloid Chemistry and Electrochemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/169814
- DOI: https://doi.org/10.1134/S0036024417120147
- ID: 169814
Дәйексөз келтіру
Аннотация
Ellipsometry and electrochemical measurements are used to study the adsorption of some substituted 1,2,4-triazoles on copper and their effect on dissolution of copper in aqueous buffer solutions at pH 7.4. It is found that the adsorption of triazole compounds on copper is polymolecular at potential Е = 0.0 V, in relation to a normal hydrogen electrode. The first layer is described by the Temkin equation with free adsorption energy (−ΔGa0) = 55.2–76.3 kJ/mol and an energy heterogeneity factor that varies from 0.91 to 2.5. The maximum value of −ΔGa0 is found for an acid and a hydrogen sulfide corrosion inhibitor that is a mixture of triazole derivatives. The same inhibitor is the one least sensitive to the energy heterogeneity of the surface of a copper electrode, due to its high chemical reactivity and ability to be adsorbed on different active sites. This inhibitor is likely chemisorbed on copper and forms an ultrathin coating in an aqueous solution that is vastly superior to similar coatings produced by the familiar corrosion inhibitors of triazole group compounds in protecting against atmospheric corrosion.
Негізгі сөздер
Авторлар туралы
Yu. Kuznetsov
Frumkin Institute of Physical Chemistry and Electrochemistry
Хат алмасуға жауапты Автор.
Email: kuznetsov@ipc.rssi.ru
Ресей, Moscow, 199071
Kh. Shikhaliev
Voronezh State University
Email: kuznetsov@ipc.rssi.ru
Ресей, Voronezh, 394018
M. Agafonkina
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Ресей, Moscow, 199071
N. Andreeva
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Ресей, Moscow, 199071
A. Semiletov
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Ресей, Moscow, 199071
A. Chirkunov
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Ресей, Moscow, 199071
A. Potapov
Voronezh State University
Email: kuznetsov@ipc.rssi.ru
Ресей, Voronezh, 394018
V. Solov’ev
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Ресей, Moscow, 199071