Acta Metallurgica Sinica (English Letters) ›› 2025, Vol. 38 ›› Issue (6): 877-888.DOI: 10.1007/s40195-025-01816-2

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

Li Zhao1,2,3, Tian-Yu Cui1,2, Wei-Wei Chang1,2,3, Hong-Chang Qian1,2,3, Yun-Tian Lou1,2,3(), Jing-Zhi Yang1,2(), Da-Wei Zhang1,2,3   

  1. 1National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
    2Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
    3BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Innovation School, University of Science and Technology Beijing, Foshan 528399, China
  • Received:2024-08-01 Revised:2024-10-30 Accepted:2024-11-27 Online:2025-06-10 Published:2025-01-22
  • Contact: Yun-Tian Lou, louyuntian@hotmail.com; Jing-Zhi Yang, zjyang@ustb.edu.cn

Abstract:

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.

Key words: Microbiologically influenced corrosion, Shewanella algae, Stainless steel, Microbial mineralization