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<p>Microbiologically influenced corrosion (MIC) associated with sulfate‑reducing bacteria (SRB) is a leading cause of pipeline failure in the oil and gas industry. Biofilm structure and distribution strongly influence MIC, but controllable modulation remains challenging. Here, we report a novel method to regulate biofilm distribution of <i>Desulfovibrio vulgaris</i> on X80 pipeline steel using epoxy resin and spherical glass beads to define three standardized areas (100, 390, 640 cm<sup>2</sup>). Combined characterization, including cell counting, H<sub>2</sub>S and H<sub>2</sub> measurement, weight loss, electron microscopy, electrochemistry, and tensile testing, was applied to evaluate MIC behavior and mechanical degradation. Larger biofilm distribution reduced sessile cell density and biofilm thickness but enhanced biogenic H<sub>2</sub>S and H<sub>2</sub> release. MIC was dominated by the extracellular electron transfer (EET) mechanism throughout 7 days, with synergistic hydrogen embrittlement from biogenic gases. Increased distribution area significantly lowered corrosion rate, pit depth, weight loss, and mechanical property degradation. This work provides a robust biofilm modulation platform and clarifies the coupled EET‑MIC and hydrogen embrittlement mechanism, offering a new strategy for mitigating MIC‑induced degradation in pipeline engineering.</p>

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Modulating biofilm distribution to control microbiologically influenced corrosion and mechanical degradation of X80 steel

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月9日

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  • Jike Yang,
  • Xiaolong Li,
  • Boyu Tang,
  • Zhiyong Liu,
  • Hongchi Ma,
  • Xiaohu Zhang,
  • Yuzhou Chen,
  • Xuewu Liu,
  • Yong Li,
  • Jiaxing Cai,
  • Yi Fan,
  • Xiaogang Li,
  • Zhong Li

摘要

Microbiologically influenced corrosion (MIC) associated with sulfate‑reducing bacteria (SRB) is a leading cause of pipeline failure in the oil and gas industry. Biofilm structure and distribution strongly influence MIC, but controllable modulation remains challenging. Here, we report a novel method to regulate biofilm distribution of Desulfovibrio vulgaris on X80 pipeline steel using epoxy resin and spherical glass beads to define three standardized areas (100, 390, 640 cm2). Combined characterization, including cell counting, H2S and H2 measurement, weight loss, electron microscopy, electrochemistry, and tensile testing, was applied to evaluate MIC behavior and mechanical degradation. Larger biofilm distribution reduced sessile cell density and biofilm thickness but enhanced biogenic H2S and H2 release. MIC was dominated by the extracellular electron transfer (EET) mechanism throughout 7 days, with synergistic hydrogen embrittlement from biogenic gases. Increased distribution area significantly lowered corrosion rate, pit depth, weight loss, and mechanical property degradation. This work provides a robust biofilm modulation platform and clarifies the coupled EET‑MIC and hydrogen embrittlement mechanism, offering a new strategy for mitigating MIC‑induced degradation in pipeline engineering.