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<p>The adhesion of <i>Shewanella algae</i> (<i>S. algae</i>) on the surface of stainless steel induced the formation and coverage of calcium carbonate minerals in the aerobic environment, and the effect of these minerals on the passive film of stainless steel was investigated by focused ion beam-scanning electron microscopy/transmission electron microscopy (FIB-SEM/TEM) and electron energy loss spectroscopy (EELS) techniques. The TEM and energy-dispersive X-ray spectroscopy (EDS) results revealed that the passive film in the region covered by mineralized particles underwent chelation between Fe and Cr compounds with CaCO<sub>3</sub>, forming an unstable amorphous layer, which accelerated the loss of Fe and Cr elements. EELS analysis showed that the loss of Fe element in the passive film was the most significant, with a transition from Fe<sup>3+</sup> to soluble Fe<sup>2+</sup> occurring, which caused by the iron-reducing property and metabolic activities of the adherent <i>S. algae</i>. The loss of the main metal elements caused the accelerated degradation of the passive film beneath the minerals.</p>

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Effect of Mineralization Induced by Shewanella algae on Passive Film of Stainless Steel via FIB-SEM/TEM and EELS

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Li Zhao,
  • Tian-Yu Cui,
  • Wei-Wei Chang,
  • Hong-Chang Qian,
  • Yun-Tian Lou,
  • Jing-Zhi Yang,
  • Da-Wei Zhang

摘要

The adhesion of Shewanella algae (S. algae) on the surface of stainless steel induced the formation and coverage of calcium carbonate minerals in the aerobic environment, and the effect of these minerals on the passive film of stainless steel was investigated by focused ion beam-scanning electron microscopy/transmission electron microscopy (FIB-SEM/TEM) and electron energy loss spectroscopy (EELS) techniques. The TEM and energy-dispersive X-ray spectroscopy (EDS) results revealed that the passive film in the region covered by mineralized particles underwent chelation between Fe and Cr compounds with CaCO3, forming an unstable amorphous layer, which accelerated the loss of Fe and Cr elements. EELS analysis showed that the loss of Fe element in the passive film was the most significant, with a transition from Fe3+ to soluble Fe2+ occurring, which caused by the iron-reducing property and metabolic activities of the adherent S. algae. The loss of the main metal elements caused the accelerated degradation of the passive film beneath the minerals.