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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (6): 1755-1763    DOI: 10.11902/1005.4537.2025.059
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SRB Induced Corrosion Behavior of a Novel Microbial Corrosion Resistant Pipeline Steel
YANG Baoqi1, YAN Maocheng2(), SHI Xianbo2, GAO Bowen2
1 Hengyang Hualing Steel Pipe Corporation Limited, Hengyang 421099, China
2 National Engineering Research Center for Corrosion Control, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Cite this article: 

YANG Baoqi, YAN Maocheng, SHI Xianbo, GAO Bowen. SRB Induced Corrosion Behavior of a Novel Microbial Corrosion Resistant Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1755-1763.

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Abstract  

The corrosion behavior of a microbial corrosion-resistant (MIC-resistant) pipeline steel induced by sulfate reducing bacteria (SRB) was investigated through morphology observation, composition analysis, microbial culture analysis and electrochemical testing. The results show that, in the SRB environment, the number of active bacteria adhered to the surface of MIC-resistant steel is significantly reduced, and accordingly the thickness of the biofilm decreases. The MIC-resistant steel effectively inhibits biofilm attachment and growth on its surface. The MIC-resistant steel exhibited higher open-circuit potential, lower corrosion current density, and higher charge transfer resistance. There are fewer corrosion products on the surface of the MIC-resistant steel, composed mainly of dense α-FeOOH scale, in the contrast, a loose Fe3O4 scale may emerge on the ordinary steel surface. The corrosion rate in mass loss of an ordinary steel is approximately 1.83 times that of the MIC-resistant steel. It follows that comprehensively optimizing the content of the three alloying elements Cu, Cr, and Ni, synergistic improvement in both anti-bacterial and anti-corrosion could be achieved for this novel steel.
Key words:  MIC resistant steel      pipeline steel      microbial corrosion      sulfate reducing bacteria      biofilm     
Received:  21 February 2025      32134.14.1005.4537.2025.059
ZTFLH:  TG172  
Fund: National Natural Science Foundation of China(51471176)
Corresponding Authors:  YAN Maocheng, E-mail: yanmc@imr.ac.cn
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YANG Baoqi
YAN Maocheng
SHI Xianbo
GAO Bowen

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.059     OR     https://www.jcscp.org/EN/Y2025/V45/I6/1755

SampleCSiMnPSCuCrNiMoFe
Ordinary steel0.140.251.20.020.010.400.400.400.14Bal.
MIC resistant steel0.070.180.30.0070.0020.551.400.550.14Bal.
Table 1  Chemical compositions of two test steels (mass fraction / %)
Fig.1  Microstructures of ordinary steel (a) and MIC resistant steel (b)
Fig.2  SEM surface morphologies (a-d) and EDS analysis results (e, f) of MIC resistant steel (a, b, e) and ordinary steel (c, d, f) after 14 d immersion in SRB inoculated solution
Fig.3  Raman spectra of the surfaces of MIC resistant steel and ordinary steel after 14 d immersion in SRB inoculated solution
Fig.4  CLSM images of MIC resistant steel (a) and ordinary steel (b) after 7 d immersion in SRB inoculated solution
Fig.5  SEM surface morphologies of ordinary steel (a-c) and MIC resistant steel (d-f) after removal of corrosion products formed during 14 d immersion in SRB inoculated solution
Fig.6  Surface maximum pitting morphologies of MIC resistant steel (a) and ordinary steel (b) after 14 d immersion in SRB inoculation solution
Fig.7  Potentiodynamic polarization curves of MIC resistant steel and ordinary steel after 14 d immersion in SRB inoculation solution
Steelβa / mV·dec-1βc / mV·dec-1Icorr / μA·cm-2Ecorr / mVCorrosion rate / mm·a-1
Ordinary steel34610214.9-8880.173
MIC resistant steel24376.38.53-8470.0992
Table 2  Fitting results of potentiodynamic polarization curves of ordinary steel and MIC resistant steel in Fig.7
Fig.8  Nyquist (a, c) and Bode (b, d) plots of MIC resistant steel (a, b) and ordinary steel (c, d) after immersion in SRB inoculated solution for different time
Fig.9  Equivalent circuit model used to fit EIS data (Rs－solution resistance, Qbc－biofilm and corrosion product layer capacitance, Rbc－biofilm and corrosion product layer resistance, Qct－interface double-layer capacitance, Rct－metal surface charge transfer resistance)
SamplesTime / dRs / Ω·cm2Rbc / Ω·cm2Qbc / Ω-1·cm-2·s nRct / Ω·cm2Qct / Ω-1·cm-2·s n
Ordinary steel13.6480085.82 × 10-452.971.43 × 10-3
23.5291033.12 × 10-30.2581.73 × 10-2
43.6133113.79 × 10-34831.20 × 10-2
73.8746716.44 × 10-329304.01 × 10-3
103.8120456.39 × 10-331144.87 × 10-3
143.8710196.34 × 10-373396.29 × 10-3
MIC resistant steel13.560.115.09 × 10-42.31×1046.01 × 10-4
23.626922.02 × 10-327.916.14 × 10-3
43.4724.51.02 × 10-22693.70 × 10-3
73.558.263.71 × 10-31.66 × 1042.83 × 10-3
103.5938.23.23 × 10-31.37 × 1042.93 × 10-3
143.6536.33.52 × 10-35.66 × 1042.10 × 10-3
Table 3  Fitting results of EIS of two test steels in Fig.8
Fig.10  Variations of Rct + Rbc of MIC resistant steel and ordinary steel with immersion time in SRB inoculated solution
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