Open AccessResearch influence of biological corrosion on the strength of steel structures of hydrotechnical construction of long-term operation in aggressive environments
Author(s) -
В. Д. Макаренко,
Viktor Viktor,
Volodymyr Lyubenko,
S.Yu. Maksymov,
Volodymyr Osadchyy,
Ihor Nedashkovsʹkyy
Publication year - 2021
Publication title -
problemi vodopostačannâ, vodovìdvedennâ ta gìdravlìki
Language(s) - English
Resource type - Journals
ISSN - 2524-0021
DOI - 10.32347/2524-0021.2021.36.27-38
Subject(s) - sulfate reducing bacteria , corrosion , sulfate , iron bacteria , sulfur , anaerobic bacteria , bacteria , environmental chemistry , sulfide , chemistry , metal , microorganism , anaerobic corrosion , sulfuric acid , aerobic bacteria , hydrogen sulfide , oxygen , inorganic chemistry , geology , organic chemistry , paleontology
Biocorrosion is caused by the vital activity of various microorganisms that use metals as a nutrient medium or produce products that destroy metal structures. Anaerobic is the most dangerous (growth without oxygen) sulfate-reducing bacteria, which are present in slimy and swamp soils. Bacteria restore sulfate ions to sulfides ions, accelerating corrosion of metal. Life of aerobic bacteria occurs only in the presence of oxygen. Bacteria oxidize sulfur to sulfuric acid, the concentration of which in separate places can reach 10%. Ironobacteria absorb iron in ionic form and excrete it in the form of non-dissolved compounds. Since non-dissolved products are distributed on the metal surface unevenly, the electrochemical heterogeneity of the surface occurs, which accelerates corrosion. Microorganisms formed on the metal surface can cause not only corrosion. They can also increase the concentration of hydrogen sulfide in the environment by increasing the amount of deposits on steel hydraulic structures.
The greatest danger from the point of view of corrosion is sulfate reducing bacteria (SRB), which are widespread in hydraulic environments. Sulfate renewable bacteria belong to the class of anaerobic bacteria, the vital activity of which can be without oxygen. Aerobic bacteria, such as ironbacteria (IB) and sulfur bacteria or thionic (TB), which are present in groundwater with SRB, is viable only in the presence of oxygen. Anaerobic and aerobic bacteria have a common existence environment, and therefore often the development of one species creates favorable conditions for others.