Abstract
The influence of sulfate-reducing bacteria (SRB) on the corrosion behaviors of X80 pipeline steel was investigated in a soil environment by electrochemical techniques and surface analysis. It was found that SRB grew well in the acidic soil environment and further attached to the coupon surface, resulting in microbiologically influenced corrosion (MIC) of the steel. The corrosion process of X80 steel was significantly affected by the SRB biofilm on the steel surface. Steel corrosion was inhibited by the highly bioactive SRB biofilm at the early stage of the experiment, while SRB can accelerate the corrosion of steel at the later stage of the experiment. The steel surface suffered severe pitting corrosion in the SRB-containing soil solution.
Highlights
Corrosion has been acknowledged as the largest capital loss in oil/gas industries, leading to various environmental and economic problems and even a fatal threat [1,2].Microbiologically influenced corrosion (MIC) refers to material degradation that is influenced by various microorganisms existing in soil, marine, and industrial environments, which is a serious threat to pipeline integrity [3]
Influenced corrosion (MIC) refers to material degradation that is influenced by various microorganisms existing in soil, marine, and industrial environments, which is a serious threat to pipeline integrity [3]
Electrochemical impedance spectroscopy (EIS) combined with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) techniques was used to investigate the effect of sulfate-reducing bacteria (SRB) on the corrosion behavior of X80 steel in acidic soils
Summary
Corrosion has been acknowledged as the largest capital loss in oil/gas industries, leading to various environmental and economic problems and even a fatal threat [1,2]. Enhanced corrosion of buried pipeline steel by SRB in soil environments has been reported. Xu et al [13] reported that SRB corrosion is severe under a disbonded coating in a neutral soil solution. Wei et al [14] demonstrated that the corrosion of steel was accelerated by SRB under a disbonded coating in an acidic soil solution. Wei et al [28] found that the stray current is a key factor leading to severe corrosion of pipeline steel in acidic soils. Electrochemical impedance spectroscopy (EIS) combined with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) techniques was used to investigate the effect of SRB on the corrosion behavior of X80 steel in acidic soils
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