Tetrazolium salts as inhibitors of bacterial corrosion of metals

• A.A. Kalinina, T.N. Sokolova, E.P. Komova, I.M. Shishkina and A.S. Shuravin

Nizhny Novgorod State Technical University, 24, ul. Minina, 603950 Nizhny Novgorod, Russian Federation

Abstract: In this work, we made an attempt to determine the relationship between the ability of bacteria to reduce tetrazolium salts and their corrosion activity. The adsorption of tetrazolium salts on the surface of zinc and low-carbon steel has been shown to be accompanied by their reduction to give formazans. It has been revealed that the formation of corrosive products of oxygen bioconversion on the surface of metals under the influence of Pseudomonas fluorescens is hindered by adsorbed tetrazolium salts. Chemical kinetics methods were used to establish that the products of the reduction of tetrazolium salts by Pseudomonas fluorescens irreversibly block the redox centers of the electron transport chain of bacteria at low degree of reagent conversion. It is suggested that tetrazolium salts can inhibit the biogenic factor in the bacterial corrosion of metals. The adverse effects of steel exposure to Pseudomonas fluorescens bacteria were studied by determining the change in mechanical properties when the samples were torn at a strain rate of 0.1 mm/s. The observed decrease in the average tensile strength compared to the initial state is explained by highly localized pitting corrosion in the form of small, evenly distributed surface depressions.

Keywords: bacterial corrosion, low carbon steel, zinc, tetrazolium salts, kinetics, inhibition

Int. J. Corros. Scale Inhib., 2023, 12, no. 4, 2129-2141
doi: 10.17675/2305-6894-2023-12-4-37

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