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<p>Stainless steel, as a widely used structural material in marine engineering, is seriously threatened by microbial corrosion during service. In this study, the corrosion behavior of 316L stainless steel in the presence of <i>Shewanella algae</i> was systematically investigated through immersion experiments (1-7&#xa0;days) in 2216E medium under controlled aerobic conditions (30&#xa0;°C, pH 7.5-8.5). The samples were analyzed using scanning electron microscopy, x-ray diffraction, electrochemical impedance spectroscopy, and x-ray photoelectron spectroscopy. Results revealed that <i>S. algae</i> accelerated pitting though a 6.1-fold increase in corrosion current density (<i>I</i><sub>corr</sub> = 0.084&#xa0;μA/cm<sup>2</sup>) compared to sterile conditions. However, after 3&#xa0;days of immersion, microbial metabolism promoted Ca<sup>2+</sup> and Mg<sup>2+</sup> mineralization, forming a dense rhombic film composed of CaCO<sub>3</sub> and CaMg(CO<sub>3</sub>)<sub>2</sub>. This mineralized film increased the charge transfer resistance (<i>R</i><sub>ct</sub>) from 4.51 × 10<sup>5</sup> (Day 1) to 7.10 × 10<sup>6</sup>&#xa0;Ω·cm<sup>2</sup> (Day 7), indicating a protective effect. These findings suggest that <i>S. algae</i>-induced mineralization offers a potential strategy for mitigating microbial corrosion in marine environments, though its long-term stability requires further validation.</p>

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Effects of Shewanella algae on Corrosion Behavior of 316L Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Zixuan Shao,
  • Jianhua Tang,
  • Zhizhong Dong,
  • Xin Zhang

摘要

Stainless steel, as a widely used structural material in marine engineering, is seriously threatened by microbial corrosion during service. In this study, the corrosion behavior of 316L stainless steel in the presence of Shewanella algae was systematically investigated through immersion experiments (1-7 days) in 2216E medium under controlled aerobic conditions (30 °C, pH 7.5-8.5). The samples were analyzed using scanning electron microscopy, x-ray diffraction, electrochemical impedance spectroscopy, and x-ray photoelectron spectroscopy. Results revealed that S. algae accelerated pitting though a 6.1-fold increase in corrosion current density (Icorr = 0.084 μA/cm2) compared to sterile conditions. However, after 3 days of immersion, microbial metabolism promoted Ca2+ and Mg2+ mineralization, forming a dense rhombic film composed of CaCO3 and CaMg(CO3)2. This mineralized film increased the charge transfer resistance (Rct) from 4.51 × 105 (Day 1) to 7.10 × 106 Ω·cm2 (Day 7), indicating a protective effect. These findings suggest that S. algae-induced mineralization offers a potential strategy for mitigating microbial corrosion in marine environments, though its long-term stability requires further validation.