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<p>In this paper, a copper wire beam electrode (WBE) was used to monitor the formation and cracking behavior of the solid electrolyte interface (SEI) film on the surface of FeSi alloy anode materials. The corrosion products were analyzed via scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that the corrosion pattern of FeSi alloy in electrolyte solution changes from local corrosion to uniform corrosion, which indicates the gradual formation of the SEI film on the FeSi alloy surface. When a column of FeSi alloy was removed in situ, corrosion behavior was divided into three stages. In the initial stage, local corrosion was observed with the FeSi alloy acting as the anode. In the middle stage, the exposed Cu electrode acted as the anode for local corrosion. In the later stage, cracking of the SEI film and further propagation of cracks on the surface of FeSi alloy lead to uniform corrosion of the Cu WBE. This phenomenon showed that the formation of corrosion products and the accumulation of fluorine ions on the Cu WBE are the reasons for the rupture of SEI film and the formation of micro − cracks on the surface of FeSi alloy.</p>

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In situ monitoring of corrosion and crack propagation behavior of FeSi alloy using wire beam electrode

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Huaiyu Zhong,
  • Zhanglin Zhu,
  • Haoqi Cai,
  • Dianxu Ruan,
  • Zhimei Li,
  • Qingdong Zhong,
  • Lei Huang

摘要

In this paper, a copper wire beam electrode (WBE) was used to monitor the formation and cracking behavior of the solid electrolyte interface (SEI) film on the surface of FeSi alloy anode materials. The corrosion products were analyzed via scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that the corrosion pattern of FeSi alloy in electrolyte solution changes from local corrosion to uniform corrosion, which indicates the gradual formation of the SEI film on the FeSi alloy surface. When a column of FeSi alloy was removed in situ, corrosion behavior was divided into three stages. In the initial stage, local corrosion was observed with the FeSi alloy acting as the anode. In the middle stage, the exposed Cu electrode acted as the anode for local corrosion. In the later stage, cracking of the SEI film and further propagation of cracks on the surface of FeSi alloy lead to uniform corrosion of the Cu WBE. This phenomenon showed that the formation of corrosion products and the accumulation of fluorine ions on the Cu WBE are the reasons for the rupture of SEI film and the formation of micro − cracks on the surface of FeSi alloy.