ISSN 2305-6894

The stimulating role of the products of oxygen biotransformation by organotrophic bacteria in metal corrosion: A review

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Federal state budgetary higher education institution “R.E. Alexeev Nizhny Novgorod state technical university”, ul. K. Minina, 603950 Nizhny Novgorod, Russian Federation

Abstract: The review discusses the role of oxygen biotransformation products – hydrogen peroxide and ammonia formed during the vital activity of microorganisms – in the initiation of biological corrosion. The quantitative characteristics of the content of hydrogen peroxide, one of the main corrosive components in the exudate, are given. Using scanning electron microscopy, it has been shown that the effect of organotrophic bacteria on steel samples begins with the formation of a biofilm on the surface, as visualized by the appearance of a liquid-drop exudate with pH>7 on its surface, especially in the edge regions. It has been shown that the biological corrosion of low-carbon steel is of mixed type, i.e., pitting-ulcer corrosion combined with stress corrosion cracking and intergranular corrosion.

Keywords: biological corrosion, organotrophic bacteria, hydrogen peroxide, ammonia

Int. J. Corros. Scale Inhib., , 9, no. 4, 1459-1476 PDF (738 K)
doi: 10.17675/2305-6894-2020-9-4-17

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