Effect of uniaxial elastic stress on corrosion of X80 pipeline steel in an acidic soil solution containing sulfate-reducing bacteria trapped under disbonded coating

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.

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Corrosion of initial pits on abandoned X52 pipeline steel in a simulated soil solution containing sulfate-reducing bacteria

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2020.04.090 ◽

2020 ◽

Vol 9 (4) ◽

pp. 7180-7189

Author(s):

Hongwei Liu ◽

Y. Frank Cheng

Keyword(s):

Soil Solution ◽

Pipeline Steel ◽

Sulfate Reducing Bacteria ◽

Sulfate Reducing ◽

Reducing Bacteria

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Microbial corrosion of X52 pipeline steel under soil with varied thicknesses soaked with a simulated soil solution containing sulfate-reducing bacteria and the associated galvanic coupling effect

Electrochimica Acta ◽

10.1016/j.electacta.2018.02.002 ◽

2018 ◽

Vol 266 ◽

pp. 312-325 ◽

Cited By ~ 33

Author(s):

Hongwei Liu ◽

Y. Frank Cheng

Keyword(s):

Soil Solution ◽

Coupling Effect ◽

Pipeline Steel ◽

Sulfate Reducing Bacteria ◽

Microbial Corrosion ◽

Galvanic Coupling ◽

Sulfate Reducing ◽

Reducing Bacteria

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Effect of Alternating Current and Sulfate-Reducing Bacteria on Corrosion of X80 Pipeline Steel in Soil-Extract Solution

Materials ◽

10.3390/ma12010144 ◽

2019 ◽

Vol 12 (1) ◽

pp. 144 ◽

Cited By ~ 7

Author(s):

Yongchang Qing ◽

Yunlong Bai ◽

Jin Xu ◽

Tangqing Wu ◽

Maocheng Yan ◽

...

Keyword(s):

Current Density ◽

Pipeline Steel ◽

Sulfate Reducing Bacteria ◽

Alternating Current ◽

Soil Extract ◽

X80 Pipeline Steel ◽

Sulfate Reducing ◽

Extract Solution ◽

Ac Current ◽

Reducing Bacteria

AC corrosion has been considere d as a threat to the corrosion of buried pipelines. Effects of sulfate-reducing bacteria (SRB) and alternating current (AC) on corrosion of X80 pipeline steel in soil-extract solution were investigated by electrochemical and surface analysis techniques. AC current can inhibit the growth of planktonic and sessile SRB. The corrosion current density of steel with 10 mA/cm2 AC current is about nine times bigger than that without AC current. Corrosion morphology changes from small pitting to large pitting holes with increasing AC current density. Corrosion of steel with SRB and AC current is controlled by both active dissolution of iron and film degradation.

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