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中国腐蚀与防护学报  2025, Vol. 45 Issue (2): 479-488     CSTR: 32134.14.1005.4537.2024.101      DOI: 10.11902/1005.4537.2024.101
  研究报告 本期目录 | 过刊浏览 |
石油管材用含Cu钢焊接接头的微生物腐蚀研究
燕冰川1, 曾云鹏2,3, 张宁1, 史显波2(), 严伟2
1.国家管网集团储运技术发展有限公司 天津 300457
2.中国科学院金属研究所 沈阳 110016
3.中国特种设备检测研究院长三角分院 嘉兴 314000
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
引用本文:

燕冰川, 曾云鹏, 张宁, 史显波, 严伟. 石油管材用含Cu钢焊接接头的微生物腐蚀研究[J]. 中国腐蚀与防护学报, 2025, 45(2): 479-488.
Bingchuan YAN, Yunpeng ZENG, Ning ZHANG, Xianbo SHI, Wei YAN. Microbiologically Influenced Corrosion of Cu-bearing Steel Welded Joints for Petroleum Pipes[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 479-488.

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摘要: 

利用电化学测试和短时浸泡实验研究了石油管材用含Cu钢焊接接头不同区域，包括母材(BM)、热影响区(HAZ)、焊缝(WM)的微生物腐蚀行为。生物膜微观形貌结果表明，BM区域细菌生物膜均匀致密，而WM和HAZ区域的细菌生物膜松散聚集。电化学结果表明，BM试样(Rct + Rf)电阻值随浸泡时间的延长稳定增加，而WM和HAZ试样的(Rct + Rf)电阻值出现波动现象。最终导致BM试样表面点蚀坑少且浅，而WM和HAZ试样表面的点蚀坑小而深且聚集分布。分析认为，WM和HAZ的组织不均匀性为细菌选择性附着提供了位点，由此造成的生物膜微观不均匀分布促进了不同区域组织之间的局部腐蚀是WM和HAZ耐蚀性较差的主要原因。
关键词 ： 含Cu钢,  焊接接头,  显微组织,  微生物腐蚀    
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
收稿日期: 2024-03-28      32134.14.1005.4537.2024.101
ZTFLH:  TG142.1  
基金资助:国家自然科学基金(52201093)
通讯作者: 史显波，E-mail：xbshi@imr.ac.cn，研究方向为先进钢铁结构材料的研究及应用
Corresponding author: SHI Xianbo, E-mail: xbshi@imr.ac.cn
作者简介: 燕冰川，男，1979年生，博士，正高级工程师
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https://www.jcscp.org/CN/10.11902/1005.4537.2024.101      或      https://www.jcscp.org/CN/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.
表1  钢板母材和焊丝的化学成分 (mass fraction / %)
图1  焊接接头中组织和性能检测的取样位置示意图
图2  焊接接头的宏观形貌
图3  时效前焊接接头不同部位的显微组织形貌
图4  时效后的焊接接头不同部位的显微组织形貌
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
表2  母材和焊接接头的拉伸性能和冲击性能
图5  焊接接头不同部位在接种SRB的溶液中浸泡14 d后的CLSM图像
图6  焊接接头的不同部位试样表面固着活/死细菌数量统计结果
图7  母材和焊接接头的不同部位在接菌溶液中的Nyquist谱图随时间的变化
图8  用于阻抗谱拟合的等效电路模型
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
表3  EIS数据拟合结果
图9  母材和焊接接头的不同部位在接菌溶液中的(Rct+ Rf)随时间的变化曲线
图10  母材和焊接接头的不同部位在接菌溶液中浸泡14 d后的表面形貌及相应位置的EDS分析
图11  母材和焊接接头的不同部位在接菌溶液中浸泡14 d后的表面腐蚀形貌和最大点蚀坑形貌
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