3-Alkylsulfonyl-5-amino-1,2,4-triazoles – new corrosion inhibitors of copper and copper-containing alloys

• A.A. Kruzhilin¹, D.S. Shevtsov¹, D.V. Lyapun¹, A.Yu. Potapov¹, Kh.S. Shikhaliev¹, O.A. Kozaderov¹, D.Yu. Vandyshev² and V.B. Sulimov^2,3

¹ Voronezh State University, Universitetskaya pl. 1, 394018 Voronezh, Russian Federation
² Moscow Center of Fundamental and Applied Mathematics, Leninskie Gory str., 1, 119234 Moscow, Russian Federation
³ Research Computing Center, Lomonosov Moscow State University, Leninskie Gory str., 1, building 4, Moscow, 119234, Russian Federation

Abstract: The article describes a method for the synthesis and evidence of the structure of new compounds of the class of 3-alkylsulfonyl-5-amino-1,2,4-triazoles. The inhibitory effect of the synthesized substances on copper corrosion in neutral and acidic chloride-containing media was evaluated using direct tests in a salt-spray chamber and weight loss measurements as well as potentiodynamic polarization measurements. It has been established that some of the studied compounds can be highly effective copper corrosion inhibitors under the studied conditions. The degree of protection increases with increasing inhibitor concentration. The results of tests in an acidic chloride environment generally correlate with the corresponding experiments in neutral aqueous solutions. The highest degree of protection was obtained for 3-butylsulphonyl-5-amino-1H-1,2,4-triazole, 3-benzylsulphonyl-5-amino-1H-1,2,4-triazole and 3-phenethylsulphonyl-5-amino-1H-1,2,4-triazole at a concentration of 1.00 mM, as well as for 3-propylsulphonyl-5-amino-1H-1,2,4-triazole at a concentration of 0.01 mM. Despite the low degrees of protection in acidic solutions, 3-pentylsulphonyl-5-amino-1H-1,2,4-triazole and 3-nonylsulphonyl-5-amino-1H-1,2,4-triazole were found to be very effective in protecting copper from atmospheric corrosion based on experiments in a salt spray chamber. This result is probably achieved due to the formation of a surface film of the inhibitor, which is characterized by high hydrophobicity, and therefore prevents physical contact of the salt fog with the metal.

Keywords: copper, corrosion inhibitors, chlorides, triazole derivatives, alkylsulfones

Int. J. Corros. Scale Inhib., 2022, 11, no. 4, 1703-1715
doi: 10.17675/2305-6894-2022-11-4-19

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