Inhibition effect of phenothiazine derivative on the corrosion of low-carbon steel caused by sulfate-reducing bacteria

• O.A. Evtukhovskaya¹, M.A. Agievich², A.I. Marshakov², A.A. Gribankova³ and M.A. Gavryushina²

¹ St. Petersburg University of the Ministry of the Internal Affairs of Russia, Pilot Pilutov str. 1, 198206 St. Petersburg, Russian Federation
² A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
³ St. Petersburg State Marine Technical University, Lotsmanskaya str. 3, 190121 St. Petersburg, Russian Federation

Abstract: Microorganisms and their waste products play a crucial role in the destruction of iron and its alloy structures. Their activity leads to characteristic signs of bio-damage, which degrade the operational performance of various systems and cause damage to technological equipment. Phenothiazine and its derivatives show promise as effective biocorrosion inhibitors. The aim of this study was to investigate the influence of sulfate-reducing bacteria Desulfovibrio desulfuricans, isolated from natural seawater environments, on low-carbon steel – a primary material in construction – and to evaluate the inhibition and biocidal properties of 6-(10H-phenothiazin-10-yl)benzene-1,3,4-trichloro-2,5-diol (OC) under anaerobic conditions. The influence of OC on the corrosion rate of low-carbon steel, as well as bacterial activity, was studied using gravimetric, electrochemical, and microscopic analysis methods. The results demonstrate that the addition of OC to a water-salt medium containing SRB alters the medium’s properties, enhancing the corrosion resistance of steel samples with an inhibitor protection efficiency of 82–86%. Additionally, OC reduces the total surface area of biofilm and decreases hydrogen sulfide concentration.

Keywords: microbiological corrosion, inhibitor, polarization, sulfate-reducing bacteria

Int. J. Corros. Scale Inhib., 2025, 14, no. 2, 420-436
doi: 10.17675/2305-6894-2025-14-2-1

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