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

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