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Open AccessArticle

Corrosion of α-Brass in Solutions Containing Chloride Ions and 3-Mercaptoalkyl-5-amino-1H-1,2,4-triazoles

1
Faculty of Chemistry, Voronezh State University, Universitetskaya pl. 1, 394018 Voronezh, Russia
2
Department of Chemistry, National Institute of Technology, Kurukshetra 136119, Haryana, India
3
Laboratory of Physico-Chemical Fundamentals of Corrosion Inhibition of Metals and Alloys, A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, (IPCE RAS), 31 Leninski Prospect, 119071 Moscow, Russia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(14), 2821; https://doi.org/10.3390/app9142821
Received: 14 June 2019 / Revised: 4 July 2019 / Accepted: 10 July 2019 / Published: 15 July 2019
(This article belongs to the Special Issue Advances in Organic Corrosion Inhibitors and Protective Coatings)
The protective effect of 3-mercaptoalkyl derivatives of 5-amino-1H-1,2,4-triazole against corrosion of α-brass in a chloride media was studied using polarization curves, electrochemical impedance spectroscopy, and full-scale corrosion testing. The brass electrode remains passive up to the activation potential, which is much higher than in solutions without organic additives, and it increases with the concentration of the inhibitor. The protection degree of all the studied inhibitors reaches its maximum of over 99% in solutions with the concentration of the inhibitor Cinh ≥ 0.10 mM. The protective effect increases with the length of the alkyl chain. All the studied derivatives are effective against atmospheric corrosion of α-brass. A protective film is formed on the brass surface, and it most probably includes oxides as well as complex compounds of zinc and copper with the molecules of the inhibitors. The impedance spectroscopy demonstrated that the presence of the inhibitor results in a decrease in the double-layer capacitance and an increase in the polarization resistance, which proves that the protective film actually forms on the brass surface. The quantum chemical analysis of the optimized molecular structures demonstrates that all the studied inhibitors should have a similar protective effect, which agrees with the experimental results. View Full-Text
Keywords: brass; chloride; triazole derivatives brass; chloride; triazole derivatives
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Kozaderov, O.; Shikhaliev, K.; Prabhakar, C.; Tripathi, A.; Shevtsov, D.; Kruzhilin, A.; Komarova, E.; Potapov, A.; Zartsyn, I.; Kuznetsov, Y. Corrosion of α-Brass in Solutions Containing Chloride Ions and 3-Mercaptoalkyl-5-amino-1H-1,2,4-triazoles. Appl. Sci. 2019, 9, 2821.

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