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Study on corrosion behavior of X80 steel under stripping coating by sulfate reducing bacteria

Authors
  • Cui, Yan-Yu1
  • Qin, Yong-Xiang1
  • Ding, Qing-Miao1
  • Gao, Yu-Ning1
  • 1 College of Airport, Civil Aviation University of China, Tianjin, 300300, P. R. China , Tianjin (China)
Type
Published Article
Journal
BMC Biotechnology
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Jan 09, 2021
Volume
21
Issue
1
Identifiers
DOI: 10.1186/s12896-020-00664-5
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundAt present, microorganism has been considered as important factors that threaten to buried pipelines with disbonded coatings. Aiming at the problem of unknown corrosion mechanism of sulfate-reducing bacteria (SRB), a series of studies have been carried out in this paper. Spectrophotometer and fluorescent labeling technology are used to study the growth and attachment of SRB in the simulated soil solution. The corrosion behavior of X80 pipeline steel with or without SRB was researched by electrochemical methods such as open circuit potential, dynamic potential polarization curve, and electrochemical impedance spectroscopy. The microscopic morphology of the corrosion products on the surface was observed with a scanning electron microscope (SEM), and the element content of the corrosion products on the surface of the sample after corrosion was observed using X-ray energy spectrum (EDS) analysis.ResultsThe results showed that the growth and reproduction of SRB caused the pH of the soil simulated solution to increase, which may promote the corrosion of X80 steel. In addition, the cathode reaction of X80 steel in a sterile environment is the reduction of H+, and the main corrosion product is iron oxide. When the soil simulation solution contains SRB, the cathodic reaction is controlled by both H+ reduction and sulfide depolarization reactions, and FeS appears in the corrosion products.ConclusionAlthough the life cycle of SRB is only about 14 days, the corrosion of X80 steel is greatly promoted by SRB, and even causes corrosion perforation, which will bring huge economic losses and serious safety hazards.

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