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TY - JOUR
TI - Corrosion behavior and mechanism of carbon steel influenced by interior deposit microflora of an in-service pipeline
AU - Su, Hong
AU - Tang, Ruohao
AU - Peng, Xiaowei
AU - Gao, Aiguo
AU - Han, Yejun
T2 - Bioelectrochemistry
AB - Investigation of carbon steel corrosion influenced by in-situ microbial communities can provide reliable information about microbiologically influenced corrosion (MIC) in the oil and gas field. Here, we investigated the 90-day corrosion behavior of Q235 carbon steel influenced by interior deposit microflora of an in-service pipeline using open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). Linear sweep voltammetry (LSV), 16S rRNA gene sequencing, and surface analysis were used to comprehensively analyze the corrosion mechanisms. The results indicated that OCP was decreased while the charge transfer resistance (Rct) was increased, and that steel corrosion was inhibited during the first 45 days. Subsequently, OCP was significantly increased while Rct was rapidly decreased, and steel corrosion was enhanced. After 90-day immersion, severe pitting corrosion with a maximum pit depth of 89.6 μm occurred on the steel surface. Viable microbes in the final biofilm significantly increased the cathodic current. Iron carbonate, chukanovite and cementite were identified as the main corrosion products on the steel surface. Methanobacterium dominated the final biofilm community. These observations indicate that the corrosion mechanism of the final biofilm can be explained by extracellular electron transfer MIC in which microbes corrode steel by direct electron uptake.
DA - 2019/11/19/
PY - 2019
DO - 10.1016/j.bioelechem.2019.107406
DP - ScienceDirect
SP - 107406
J2 - Bioelectrochemistry
LA - en
SN - 1567-5394
UR - http://www.sciencedirect.com/science/article/pii/S1567539419302749
Y2 - 2019/11/25/07:54:47
KW - 16S rRNA sequencing
KW - Carbon steel
KW - EIS
KW - direct electron uptake
KW - microbiologically influenced corrosion
KW - polarization
ER -