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<p>This study investigates the microbiologically influenced corrosion of low-carbon steels with varying Cu content (≤ 0.4, 2.31, 6.01 wt%) under <i>Bacillus cereus</i> using weight loss, electrochemical tests, and surface analyses. Both high Cu and <i>B. cereus</i> promote α-FeOOH and Cu-rich layers, reducing corrosion. Quantitatively, after 28 days, the corrosion rate of 0.4 wt% Cu steel decreases by ~ 38% in the presence of <i>B. cereus</i> versus sterile conditions, while 6.01 wt% Cu steel exhibits a ~ 62% lower rate than 0.4 wt% Cu steel under biotic conditions. Electrochemical data corroborate this, with polarization resistance of 6.01 wt% Cu steel peaking at 1072 Ω·cm² at 21 days. This synergistic inhibition offers a strategy for designing advanced corrosion- and fouling-resistant steels.</p> Graphical abstract <p>Under the synergistic effect of copper and Bacillus cereus in carbon steel, a dense α-FeOOH/copper-enriched passivation layer forms, enhancing the protective efficacy for carbon steel. This offers a promising strategy for designing corrosion-resistant and fouling-resistant steels in marine environments</p>

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Bacillus cereus-induced passivation of copper-containing low-carbon steel surfaces: protective mechanisms at the microorganism-metal interface

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Yingyang Zhao,
  • Yin Lei,
  • Haining Du,
  • Jing Guo,
  • Pengyu Wen,
  • Yingxue Teng

摘要

This study investigates the microbiologically influenced corrosion of low-carbon steels with varying Cu content (≤ 0.4, 2.31, 6.01 wt%) under Bacillus cereus using weight loss, electrochemical tests, and surface analyses. Both high Cu and B. cereus promote α-FeOOH and Cu-rich layers, reducing corrosion. Quantitatively, after 28 days, the corrosion rate of 0.4 wt% Cu steel decreases by ~ 38% in the presence of B. cereus versus sterile conditions, while 6.01 wt% Cu steel exhibits a ~ 62% lower rate than 0.4 wt% Cu steel under biotic conditions. Electrochemical data corroborate this, with polarization resistance of 6.01 wt% Cu steel peaking at 1072 Ω·cm² at 21 days. This synergistic inhibition offers a strategy for designing advanced corrosion- and fouling-resistant steels.

Graphical abstract

Under the synergistic effect of copper and Bacillus cereus in carbon steel, a dense α-FeOOH/copper-enriched passivation layer forms, enhancing the protective efficacy for carbon steel. This offers a promising strategy for designing corrosion-resistant and fouling-resistant steels in marine environments