ISSN 2305-6894

2018, Vol. 7, Issue 3 (pp. 271-…)

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Triazoles as a class of multifunctional corrosion inhibitors. A review. Part I. 1,2,3-Benzotriazole and its derivatives. Copper, zinc and their alloys

  • Yu.I. Kuznetsov
A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: This article presents an overview of the studies (2003–2018) on the adsorption of 1,2,3-benzotriazole (BTA) and its derivatives on copper, zinc and some of their alloys from aqueous solutions, and their corrosion inhibition capability in neutral and acidic media. It examines the effect of these organic corrosion inhibitors (CIs) on the formation of surface layers, their composition and the effectiveness of their protective action that were investigated by corrosion, electrochemical and other physicochemical methods. Considerable attention has been given to BTA itself, the wide range of corrosive media in which it can be an effective CI, an analysis of the reasons for its successful application in the practice of anticorrosion protection of copper and its alloys, as well as the new prospects of its usage and increasing its inhibition efficiency. At the same time, the drawbacks of BTA as a CI, including the sharp decrease in protective properties, up to their complete loss, in the presence of even small concentrations of H2S and sulfide ions and the relatively low efficiency in acid solutions were noted. The inhibition of corrosion of zinc and copper–zinc alloys by BTA has been discussed. It has been shown that the protection is based on the formation of sparingly soluble complexes of copper and zinc with BTA. Examples of improving the effectiveness of their protection with mixed CIs are given. The review notes the almost complete absence of studies of BTA derivatives for the protection of Zn, which could also be very useful for improving the corrosion protection not only of zinc but also galvanized steel.

Int. J. Corros. Scale Inhib., , 3, 271-307 PDF (824 K)
doi: 10.17675/2305-6894-2018-7-3-1

The effect of triazoloazepine bromide with biocidal activity on microbial copper corrosion

  • , , , and
1 Chernihiv National T.G. Shevchenko Pedagogical University, 53 Hetmana Polubotka str., 14013 Chernihiv, Ukraine
2 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, 37 Peremohy Ave, Kyiv, 03056 Ukraine

Abstract: The study deals with the effect of triazoloazepine bromide with biocidal activity against sulfate-reducing bacteria on microbial copper corrosion in neutral water–salt Postgate “B” medium with the enrichment culture of bacteria, isolated from the biofilm, formed on the metal surfaces of sewage treatment facilities. It has been established that the studied substance also inhibits the growth of iron-reducing bacteria, denitrifying bacteria and ammonifying bacteria, which ensure the stable growth of the most numerous and aggressive constituent of the enrichment culture – sulfate-reducing bacteria. It has been demonstrated that triazoloazepine bromide increases the redox potential of the corrosive medium by up to 170 mV. This enables the change of enzymatic reactions direction and considerable inhibition of sulfate-reducing activity of the enrichment culture bacteria. The morphology of the copper coupons surface after the exposure to the corrosive medium with bacterial sulfate-reduction has been examined. It has been defined that without triazoloazepine bromide the biofilm is a chaotic accumulation of bacteria in the polymeric matrix. In the presence of triazoloazepine bromide, only individual bacteria can be observed in the corrosive medium on the surface of the biofilm, which has a loose structure. It has been estimated that triazoloazepine bromide decreases the rate of microbial copper corrosion by a factor of 11.7.

Int. J. Corros. Scale Inhib., , 3, 308-317 PDF (764 K)
doi: 10.17675/2305-6894-2018-7-3-2

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