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Acta Metall Sin  2017, Vol. 53 Issue (12): 1568-1578    DOI: 10.11900/0412.1961.2017.00095
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Sulfate Reducing Bacteria Corrosion of Pipeline Steel inFe-Rich Red Soil
Libao YU1,2, Maocheng YAN1(), Jian MA3, Minghao WU3, Yun SHU1,4, Cheng SUN1, Jin XU1, Changkun YU1, Yongchang QING1,2
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Xinjiang Oilfield Branch Company, China National Petroleum Corporation, Karamay 834002, China
4 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Cite this article: 

Libao YU, Maocheng YAN, Jian MA, Minghao WU, Yun SHU, Cheng SUN, Jin XU, Changkun YU, Yongchang QING. Sulfate Reducing Bacteria Corrosion of Pipeline Steel inFe-Rich Red Soil. Acta Metall Sin, 2017, 53(12): 1568-1578.

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Abstract  

Corrosion of buried pipeline in iron-rich clay mineral, such as the red soil, is a great issue for safety and economy concern in various industrial applications, e.g. oil/gas, water, sewerage disposal systems, which may partly attribute to the active Fe oxides constituents residing in the clay. Although various parameters on metallic corrosion in red soil have been widely studied, some soil properties affecting corrosion are still not fully understood, such as synergistic action of sulfate reducing bacteria (SRB) and Fe oxides in iron-rich clay. Anaerobic SRB, which reduce sulfate to sulfide, have long been associated with corrosion of steel and have been the focus of most research on biocorrosion. Recently, there have been numerous studies showing that SRB can reduce oxidized metals, such as Fe(III), Mn(IV), and some SRB are capable of coupling metal reduction to growth, so Fe(III) reduction in clay minerals by SRB will have great impacts on corrosion processes. Most of previous studies focused on the single parameter, such as microbial activities, Fe oxides, but neglected their synergistic action. In this work, to further mechanistic understanding the synergistic action between SRB and Fe oxides, the indoor immersed experiment was desinged. Open circuit potential (EOCP), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and polarization potential scanning were used to monitor the corrosion electrochemical process of the X80 pipeline steel electrode. Microscopic surface observation was studied by SEM. The results showed that, SRB had no significant effect on the electrochemical process during the environmental adaptation period (the initial 7 d). The decrease of EOCP and electrochemical impedance (|Z|) of the X80 steel was resulted by the SRB iron respiration activity in the growing period, which significantly promoted the corrosion process of the steel. The SRB acts as an electron transport medium to participate in the electron transfer between Fe and iron oxide, which may lead to the electrochemical reduction of the iron oxides in the surface of red soil particles by the action of extracellular iron respiration, and it's the main reason to promote the local corrosion electrochemical process. The relationship between the corrosion of the material in the Fe-rich red soil and the microbial extracellular iron respiration was proposed.

Key words:  pipeline steel      microbiologically induced corrosion (MIC)      soil corrosion      electron transfer      iron respiration     
Received:  24 March 2017     
ZTFLH:  TG172.9  
Fund: Supported by Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA13040500) and National RD Infrastructure and Facility Development Program of China (No.2005DKA10400CT-2-02)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00095     OR     https://www.ams.org.cn/EN/Y2017/V53/I12/1568

Fig.1  Surface SEM images of corrosion product of X80 steel samples immerged in sterile (a~c) and sulfate reducing bacteria (SRB) inoculated (d~f) red soils for 60 d
Position O Al Si Fe S
I 42.41 9.64 13.42 34.53 -
II 34.52 9.95 18.37 24.49 12.67
Table 1  EDS analyses of the corrosion products of positions I and II in Figs.1c and f (atomic fraction / %)
Fig.2  Surface SEM images of X80 steel after corrosion products removed after 60 d exposure in sterile (a~c) and SRB inoculated (d~f) red soils
Fig.3  Growth curve of SRB amount NSRB with time
Fig.4  Open circuit potential (EOCP) of X80 steel in the sterile and SRB inoculated red soils
Fig.5  Linear polarization resistance RLPR (a) and RLPR-1 (b) of X80 steel in sterile and SRB inoculated red soils
Fig.6  Cyclic polarization plots of X80 steel after 30 d exposure in sterile and SRB inoculated red soils (icorr—corrosion current density)
Fig.7  Cyclic voltammetry plots (scan rate 5 mVs-1) measured on a glassy carbon electrode (area 0.07 cm2) after 30 d immersion in sterile and SRB inoculated red soils
Fig.8  Nyquist (a, d), Bode phase (b, e) and Bode impedance (c, f) plots of X80 pipeline steel after different times immersion in sterile (a~c) and SRB inoculated (d~f) red soils
Fig.9  Circuits model used to fit EIS data: Rs(Qf(Rf(QdlRct))) (Rs—soil resistance, Qf—corrosion product film capacitance, Rf—corrosion product film or biofilm resistance, Qdl—double electric layer capacitance, Rct—double electric layer resistance)
Time Rs Yf nf Rf Ydl ndl Rct
d Ωcm2 Ssncm-2 Ωcm2 Ssncm-2 Ωcm2
1 672.3 1.014×10-4 0.7892 485 1.638×10-4 0.8574 2823
5 1008.0 9.166×10-5 0.6360 3286 1.515×10-4 0.9000 5128
10 1106.0 8.815×10-5 0.6193 4340 2.138×10-4 0.9384 5827
15 1096.0 9.105×10-5 0.6096 4413 2.613×10-4 0.9487 6170
30 1028.0 8.345×10-5 0.6250 4596 3.791×10-4 0.8994 6995
45 967.2 8.799×10-5 0.6151 4860 4.594×10-4 0.9185 6732
60 906.4 8.177×10-5 0.6334 4324 5.172×10-4 0.8870 6563
Table 2  Fitting results of EIS in sterile red soil
Time Rs Yf nf Rf Ydl ndl Rct
d Ωcm2 Ssncm-2 Ωcm2 Ssncm-2 Ωcm2
1 399.4 1.321×10-4 0.7552 512 1.413×10-4 0.7853 2541
5 616.1 1.331×10-4 0.6525 3443 1.579×10-4 0.8977 5279
10 493.5 1.811×10-4 0.7243 440 3.971×10-4 0.7445 6052
15 466.1 6.576×10-4 0.7223 396 9.841×10-4 0.7988 5962
30 462.4 1.412×10-3 0.6871 542 1.712×10-3 0.7881 6025
45 433.6 2.391×10-3 0.6605 604 2.453×10-3 0.8748 6174
60 427.8 2.551×10-3 0.6863 652 3.471×10-3 0.8566 6292
Table 3  Fitting results of EIS in SRB inoculated red soil
Fig.10  Rs, polarization resistance Rp (a) and Rp-1 (b) of X80 pipeline steel in sterile and SRB inoculated red soil environments
Fig.11  Appearances of the sterile red soil (a) and the SRB inoculated soil (b) after 60 d immersion
Fig.12  Schematic illustration of corrosion process of X80 steel in SRB inoculated red soil environment
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