Formation of passivating layers by 1,2,4-triazole derivatives on copper in aqueous solutions
- Authors: Kuznetsov Y.I.1, Shikhaliev K.S.2, Agafonkina M.O.1, Andreeva N.P.1, Semiletov A.M.1, Chirkunov A.A.1, Potapov A.Y.2, Solov’ev V.E.1
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Affiliations:
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Voronezh State University
- Issue: Vol 91, No 12 (2017)
- Pages: 2458-2465
- Section: Colloid Chemistry and Electrochemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/169814
- DOI: https://doi.org/10.1134/S0036024417120147
- ID: 169814
Cite item
Abstract
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.
About the authors
Yu. I. Kuznetsov
Frumkin Institute of Physical Chemistry and Electrochemistry
Author for correspondence.
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Moscow, 199071
Kh. S. Shikhaliev
Voronezh State University
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Voronezh, 394018
M. O. Agafonkina
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Moscow, 199071
N. P. Andreeva
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Moscow, 199071
A. M. Semiletov
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Moscow, 199071
A. A. Chirkunov
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Moscow, 199071
A. Yu. Potapov
Voronezh State University
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Voronezh, 394018
V. E. Solov’ev
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ipc.rssi.ru
Russian Federation, Moscow, 199071