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<p>Austenitizing holding time can alter the microstructural state of bainitic weathering steel and thereby influence corrosion evolution, but its role during different corrosion stages remains unclear. In this study, low-carbon bainitic weathering steel specimens were prepared by holding at 1200 °C for 15, 60, and 120 min followed by identical isothermal treatment, and their corrosion behavior was investigated in a simulated marine atmospheric environment. Increasing holding time was accompanied by relative coarsening of the inferred prior-austenite-grain state, whereas quantitative TEM and SKPFM analyses showed no statistically significant monotonic differences in bainitic lath width or local Volta-potential difference among the three conditions. The shortest-held specimen exhibited stronger initial electrochemical activity, more frequent localized corrosion initiation, and a higher early-stage transient current response. During prolonged wet–dry cyclic corrosion, the dominant response shifted toward pit propagation, pit coalescence, and rust-layer evolution, and the longer-held specimens showed stronger later-stage integrated electrochemical responses. These results indicate that austenitizing holding time affects corrosion through coupled, stage-dependent changes in microstructural state, localized corrosion evolution, and rust-layer development, rather than through prior-austenite-grain size alone.</p>

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Effects of austenitizing holding time on the stage-dependent corrosion behavior of bainitic weathering steel

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月30日

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  • Renzheng Zhu,
  • Xiaojia Yang,
  • Qing Li,
  • Guowei Yang,
  • Xinyu Wang,
  • Weitong Wu,
  • Xuequn Cheng,
  • Xiaogang Li

摘要

Austenitizing holding time can alter the microstructural state of bainitic weathering steel and thereby influence corrosion evolution, but its role during different corrosion stages remains unclear. In this study, low-carbon bainitic weathering steel specimens were prepared by holding at 1200 °C for 15, 60, and 120 min followed by identical isothermal treatment, and their corrosion behavior was investigated in a simulated marine atmospheric environment. Increasing holding time was accompanied by relative coarsening of the inferred prior-austenite-grain state, whereas quantitative TEM and SKPFM analyses showed no statistically significant monotonic differences in bainitic lath width or local Volta-potential difference among the three conditions. The shortest-held specimen exhibited stronger initial electrochemical activity, more frequent localized corrosion initiation, and a higher early-stage transient current response. During prolonged wet–dry cyclic corrosion, the dominant response shifted toward pit propagation, pit coalescence, and rust-layer evolution, and the longer-held specimens showed stronger later-stage integrated electrochemical responses. These results indicate that austenitizing holding time affects corrosion through coupled, stage-dependent changes in microstructural state, localized corrosion evolution, and rust-layer development, rather than through prior-austenite-grain size alone.