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<p>The corrosion mechanisms involving bacterial biofilms remain a critical research focus in microbiologically influenced corrosion (MIC). In this study, the corrosion behaviors of two Arctic marine bacterial species were investigated through weight loss measurements, confocal laser scanning microscopy (CLSM), and electrochemical impedance spectroscopy (EIS). Although both strains induced similar uniform corrosion rates, they exhibited distinctly different localized corrosion behaviors, which were attributed to variations in exopolysaccharide (EPS) conformation. <i>Flavobacterium frigoris</i> (<i>F. frigoris</i>) biofilms exhibited a 24-fold higher content of β-polysaccharides compared to those of <i>Pseudomonas espejiana</i> (<i>P. espejiana</i>). These β-polysaccharides facilitated the formation of a dense biofilm barrier via hydrophobic fibrous networks and calcium salt precipitation, thereby significantly inhibiting localized corrosion. In contrast, <i>P. espejiana</i> predominantly secreted α-polysaccharides rich in hydrophilic groups, which promoted patchy biofilm colonization and accelerated pitting corrosion.This study elucidates the intrinsic connection between exopolysaccharide conformations and biofilm-mediated corrosion, providing a novel theoretical framework for understanding MIC mechanisms in marine environments.</p>

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Corrosion mechanism of steel influenced by different types of exopolysaccharides-mediated biofilms

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Xiaomin Mao,
  • Bin Jin,
  • Tao Liu,
  • Shuangling Yang,
  • Zhangwei Guo,
  • Shiyu Huang,
  • Xiao Liang,
  • Na Guo

摘要

The corrosion mechanisms involving bacterial biofilms remain a critical research focus in microbiologically influenced corrosion (MIC). In this study, the corrosion behaviors of two Arctic marine bacterial species were investigated through weight loss measurements, confocal laser scanning microscopy (CLSM), and electrochemical impedance spectroscopy (EIS). Although both strains induced similar uniform corrosion rates, they exhibited distinctly different localized corrosion behaviors, which were attributed to variations in exopolysaccharide (EPS) conformation. Flavobacterium frigoris (F. frigoris) biofilms exhibited a 24-fold higher content of β-polysaccharides compared to those of Pseudomonas espejiana (P. espejiana). These β-polysaccharides facilitated the formation of a dense biofilm barrier via hydrophobic fibrous networks and calcium salt precipitation, thereby significantly inhibiting localized corrosion. In contrast, P. espejiana predominantly secreted α-polysaccharides rich in hydrophilic groups, which promoted patchy biofilm colonization and accelerated pitting corrosion.This study elucidates the intrinsic connection between exopolysaccharide conformations and biofilm-mediated corrosion, providing a novel theoretical framework for understanding MIC mechanisms in marine environments.