Inhibiting the corrosion of MNZh 5-1 alloy in neutral solutions of 5-chloro-1,2,3-benzotrialzol
- Authors: Kuznetsov Y.I.1, Agafonkina M.O.1, Andreeva N.P.1, Arkhipushkin I.A.1, Kazansky L.P.1
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Affiliations:
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Issue: Vol 91, No 11 (2017)
- Pages: 2230-2236
- Section: Physical Chemistry of Surface Phenomena
- URL: https://journals.rcsi.science/0036-0244/article/view/169776
- DOI: https://doi.org/10.1134/S0036024417110127
- ID: 169776
Cite item
Abstract
The adsorption and protective properties of 5-chloro-1,2,3-benzotriazol (5-chloro-BTA) are studied in relation to MNZh 5-1 alloy in a chloride borate buffer solution with pH 7.4. It is shown that this inhibitor can stabilize the passive state of the alloy at a concentration of 0.12 mmol/g. The adsorption of 5-chloro-BTA on a surface of MNZh 5-1 alloy is polymolecular; the free energy of adsorption is about 80 kJ/mol. The advantages of adsorption and protective properties of 5-chloro-BTA compared to BTA on both MNZh 5-1 alloy and the metals contained in the alloy (Ni, Cu) are shown. XPS data indicate a 5-chloro-BTA monolayer formed on the surface of the alloy. This monolayer was composed of inhibitor molecules, which are normally oriented toward a surface and are not removed during ultrasonic washing of the electrode.
About the authors
Yu. I. Kuznetsov
Frumkin Institute of Physical Chemistry and Electrochemistry
Author for correspondence.
Email: kuznetsov@ips.rssi.ru
Russian Federation, Moscow, 119071
M. O. Agafonkina
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ips.rssi.ru
Russian Federation, Moscow, 119071
N. P. Andreeva
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ips.rssi.ru
Russian Federation, Moscow, 119071
I. A. Arkhipushkin
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ips.rssi.ru
Russian Federation, Moscow, 119071
L. P. Kazansky
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: kuznetsov@ips.rssi.ru
Russian Federation, Moscow, 119071