Triazoles as a class of multifunctional corrosion inhibitors. Review. Part V. 1Н-1,2,4-Triazole and its derivatives. Copper and its alloys

• Yu.I. Kuznetsov

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation

Abstract: This article continues the review of studies (2007–2022) on organic corrosion inhibitors (OCIs) of the triazole class and their effect on the corrosion–electrochemical behavior of Cu and some of its alloys. In contrast to the first three reviews of this series, which devoted to the analysis of the corrosion inhibiting properties of 1,2,3-benzotriazole (BTA) and its derivatives, this article is devoted to another large group of OСIs of the triazole class, the parents of which are 1Н-1,2,4-triazole (ТА). In this article an important role is assigned to the study of the adsorption of TA and its derivatives from a neutral solution on the Cu surfaces at a constant electrode potential. In these works, the highly sensitive in situ reflective ellipsometry method was widely used. It made it possible to measure the adsorption isotherms of the OCIs under study and to determine from them the standard free energy of adsorption of these compounds on copper or its alloy. In addition to measuring the adsorption of OCI and the results of direct corrosion tests in aggressive neutral chloride solutions containing various concentrations of triazoles and their derivatives, the possibility of using known fungicides with an appropriate chemical structure as copper OCI is discussed. Of great interest is the technique of self-assembly of well-ordered organic films on metal, which in recent years has shown itself to be a very promising and controllable method of anticorrosion protection. Click-chemistry reactions, the synthesis of 1,2,3-triazole, catalyzed not only by Cu(I) cations, but also by their complexes, are considered. Examples of effective protection of copper and its alloys from corrosion in hydrochloric, sulfuric, and even nitric acid solutions are also discussed.

Keywords: metal corrosion, adsorption, copper and its alloys, passivation, corrosion inhibitors, 1Н-1,2,4-triazole and its derivatives

Int. J. Corros. Scale Inhib., 2022, 11, no. 3, 956-979
doi: 10.17675/2305-6894-2022-11-3-5

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