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In order to mitigate corrosion of welded joints in high-speed rail tracks and enhance the safety performance of rails, electrochemical corrosion tests were conducted in this study on micro-zones—BM (base metal), HAZ (heat affected zone), and WZ (weld zone) from U75V rail welded joints. Potentiodynamic polarization, impedance analysis, as well as morphology and composition examination of the corrosion products were performed. The findings indicate that due to its uniform structure, BM exhibits the lowest corrosion rate and superior resistance against corrosion. Conversely, owing to the thermal effects during welding, WZ with a higher ferrite content tends to experience more severe corrosive reactions under the combined influence of Fe-oxidation and Cl—erosion. This study provides valuable insights into ensuring the safe service performance of seamless track rails.

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Investigation of Corrosion Behavior of Micro-zones in U75V Welded Joints from Flash Welding

  • 会议论文

  • 发表日期：

    2026年

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  • Tingting Liao,
  • Xi Zhang,
  • Chenyang Zhu,
  • Peng Su,
  • Haoxiang Xu,
  • Hongyun Li,
  • Xiaoya Shen,
  • Qibing Lv,
  • Guoqing Gou

摘要

In order to mitigate corrosion of welded joints in high-speed rail tracks and enhance the safety performance of rails, electrochemical corrosion tests were conducted in this study on micro-zones—BM (base metal), HAZ (heat affected zone), and WZ (weld zone) from U75V rail welded joints. Potentiodynamic polarization, impedance analysis, as well as morphology and composition examination of the corrosion products were performed. The findings indicate that due to its uniform structure, BM exhibits the lowest corrosion rate and superior resistance against corrosion. Conversely, owing to the thermal effects during welding, WZ with a higher ferrite content tends to experience more severe corrosive reactions under the combined influence of Fe-oxidation and Cl—erosion. This study provides valuable insights into ensuring the safe service performance of seamless track rails.