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| Microbial Corrosion Behavior of X70 Pipeline Steel in an Artificial Solution for Simulation of Soil Corrosivityat Daqing Area |
CHEN Xu1, LI Shuaibing1, ZHENG Zhongshuo1, XIAO Jibo2, MING Nanxi1, HE Chuan1( ) |
1 School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
2 SINOPEC Beijing Yanshan Petrochemical Co. , Ltd, Beijing 102500, China |
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Abstract The influence of sulfate-reducing bacteria (SRB) on the corrosion behavior of X70 pipeline steel in an artificial solution for simulation of the corrosivity of soil at Daqing area was studied by polarization curves, electrochemical impedance spectroscopy and SEM, EDS and XRD methods. The results showed that the growth cycle of SRB in the simulated solution could be differentiated as three phases: logarithmic growth phase, decay phase and death phase. SRB metabolism had significant effect on the corrosivity of the simulated solution. The pH value decreased in the first 2 d of SRB growth and then increased. Redox potential, Eh, decreased in the logarithmic growth phase, and increased in the decay and death phases. Conductivity of the solution increased in the logarithmic growth phase and decreased in the decay phase and death phases. During SRB logarithmic growth phase, the free SRB reduced sulfate into sulfide through its metabolic product H to promote the pitting corrosion of X70 steel. During the decay phase of SRB, the corrosion products formed as clusters-like, while the film was dense, which slowed down the corrosion. During the death of SRB, the biofilm dropped off and obvious cracks appeared, thereby microscopic corrosion cell formed, leading to intensified corrosion of X70 pipeline steel. Corrosion products of X70 pipeline steel in the simulated solution with SRB were mainly FeS and Fe3O4.
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Received: 13 March 2019
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| Fund: National Natural Science Foundation of China(51574147);Key Project of Education Department of Liaoning Province of China(L2017LZD004) |
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Corresponding Authors:
HE Chuan
E-mail: cx0402@sina.com
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