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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (2): 479-488    DOI: 10.11902/1005.4537.2024.101
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Microbiologically Influenced Corrosion of Cu-bearing Steel Welded Joints for Petroleum Pipes
YAN Bingchuan1, ZENG Yunpeng2,3, ZHANG Ning1, SHI Xianbo2(), YAN Wei2
1.PipeChina Storage and Transportation Technology Company, Tianjin 300457, China
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3.China Special Equipment Inspection & Research Institute Yangtze Delta Branch, Jiaxing 314000, China
Cite this article: 

YAN Bingchuan, ZENG Yunpeng, ZHANG Ning, SHI Xianbo, YAN Wei. Microbiologically Influenced Corrosion of Cu-bearing Steel Welded Joints for Petroleum Pipes. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 479-488.

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Abstract  

Welding joints are not only weak areas of conventional corrosion, but also preferred locations for microbiologically influenced corrosion (MIC). In this article, MIC behavior of different regions of the Cu-bearing steel welded joint, including the base metal (BM), heat affected zone (HAZ), and weld metal (WM), was studied by immersion test in SRB containing solution with electrochemical measurement.Results showed that a uniform and dense bacterial biofilm was formed and covered on the BM specimen, while a loose porous one on WM and HAZ specimens. The electrochemical results indicated that the (Rct + Rf) value of BM specimen increased steadily with the prolonging immersion time, while that of WM and HAZ specimens fluctuated. As a result, a few of shallow pits were observed on the surface of BM specimen, but many small and deep pits distributed in clusters appeared on the surface of WM and HAZ specimens. Analysis suggested that the microstructure inhomogeneity of WM and HAZ specimens provides sites for bacterial selective adhesion, resulting in biofilm with microscopically heterogeneous surface morphology, which promote local corrosion. Thus, the MIC resistance of WM and HAZ specimens is lower than that of BM specimen.
Key words:  Cu-bearing steel      welded joint      microstructure      microbiologically influenced corrosion     
Received:  28 March 2024      32134.14.1005.4537.2024.101
:  TG142.1  
Fund: National Natural Science Foundation of China(52201093)
Corresponding Authors:  SHI Xianbo, E-mail: xbshi@imr.ac.cn
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YAN Bingchuan
ZENG Yunpeng
ZHANG Ning
SHI Xianbo
YAN Wei

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.101     OR     https://www.jcscp.org/EN/Y2025/V45/I2/479

MaterialCMnCuNiTiNbPSSiMoAlFe
Base metal0.0280.521.351.100.0110.0170.0030.0020.13-0.01Bal.
Filler wire0.0330.561.831.94-0.018---0.10-Bal.
Table 1  Chemical compositions of base steel and filler wire
Fig.1  Schematic diagram of sampling locations for (a) mechanical properties evaluations and (b) microstructure, MIC test in welded joints
Fig.2  Macro-morphology of the weld joint. Marks (a-f) on the image are the corresponding locations to acquire high-magnification image
Fig.3  Microstructures of on the welded joint before aging condition at the position shown in Fig.2: (a, b) BM, (c, d) HAZ, (e, f) WM
Fig.4  Microstructures of different locations on the welded joint after aging: (a, b) BM, (c, d) HAZ, (e, f) WM
SampleYS / MPaUTS / MPaEL / %Akv / J
Base metal-as-rolled40349133.531
Base metal-550 oC/2 h54263327.529
Weld joint-as-rolled41951523.521
Weld joint-550 oC/2 h52563020.517
Table 2  Tensile strength and impact energy of base steel and weld joint
Fig.5  CLSM images of different areas on the weld joint immersed in SRB inoculated medium for 14 d: (a) BM, (b) WM, (c) HAZ
Fig.6  Live/dead sessile cells count on the surfaces of base steel and different areas of the weld joint immersed in SRB inoculated medium for 14 d
Fig.7  Nyquist plots of base steel and different areas of the weld joint in the SRB-inoculated medium: (a) BM, (b) WM, (c) HAZ
Fig.8  Equivalent circuits model used to fit EIS data
AreaTime / dRs / Ω·cm2Yf / S·s n ·cm-2nfRf / Ω·cm2Ydl / S·s n ·cm-2ndlRct / Ω·cm2χ2
BM13395.77 × 10-40.6071953.61 × 10-40.9243.70 × 1052.97 × 10-5
43236.55 × 10-40.6291472.43 × 10-40.9113.85 × 1055.82 × 10-4
72686.72 × 10-40.64093.32.19 × 10-40.9144.02 × 1051.29 × 10-4
102467.23 × 10-40.63273.51.97 × 10-40.9164.06 × 1051.03 × 10-4
142385.54 × 10-40.68844.21.77 × 10-40.9004.39 × 1053.23 × 10-4
WM13203.02 × 10-40.7791014.26 × 10-40.8972.33 × 1059.16 × 10-4
43052.85 × 10-40.81366.83.23 × 10-40.8773.32 × 1056.94 × 10-4
72467.07 × 10-40.76088.27.62 × 10-40.8683.35 × 1041.16 × 10-4
102312.30 × 10-40.73137.72.81 × 10-40.8803.14 × 1053.28 × 10-4
141351.46 × 10-30.6602743.09 × 10-30.9388.86 × 1041.02 × 10-4
HAZ12793.40 × 10-40.76087.33.85 × 10-40.8663.45 × 1059.38 × 10-4
42623.79 × 10-40.75588.33.92 × 10-40.8703.47 × 1051.92 × 10-4
72556.99 × 10-40.7221256.47 × 10-40.8934.09 × 1041.38 × 10-4
102133.00 × 10-40.79246.03.23 × 10-40.8782.20 × 1054.98 × 10-4
141481.43 × 10-40.7031933.03 × 10-30.9379.46 × 1041.21 × 10-4
Table 3  Fitting results of EIS data
Fig.9  Time dependence of (Rct+ Rf) values of base steel and different area of the weld joint immersed in SRB inoculated medium for 14 d
Fig.10  Corrosion surface morphologies and the corresponding EDS analysis of base steel and different areas of the weld joint after exposed in SRB inoculated medium for 14 d: (a-c) BM, (d-f) WM, (g-i) HAZ. Red arrows denote the corrosion products. Yellow circles denote the EDS analysis location
Fig.11  Pit morphologies of the base steel and different areas of the weld joint after exposed in SRB inoculated medium for 14 d: (a-c) BM, (d-f) WM, (g-i) HAZ
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