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<p>Bainitic steel is widely studied and applied due to its high performance. Two types of bainitic steels were developed: one containing multiple alloying elements, designated as SiMnAl-CrNiMo steel, and the other, a lean alloyed steel composed only of Si, Mn, and Al, referred to as plain SiMnAl steel. A comparative study was carried out to evaluate their corrosion resistance in an industrial atmospheric environment. The research results revealed that the microstructure of both steels consists mainly of bainitic ferrite and retained austenite. And the plain SiMnAl steel has a lower content of retained austenite and finer microstructure characteristics than the SiMnAl-CrNiMo steel. Corrosion resistance tests shown that conventionally alloyed SiMnAl-CrNiMo steels have lower weight loss and weight loss rates than the plain SiMnAl steel. The thickness of the rust layer increases with prolonged corrosion time. Both types of steel exhibit iron oxides, Al(OH)<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> in their corrosion products. Cr<sub>2</sub>O<sub>3</sub> was additionally identified in the SiMnAl-CrNiMo steel. It suggested that both Al and Cr contribute positively to the corrosion resistance. Polarization curve analysis revealed that the SiMnAl-CrNiMo steel exhibited both a higher corrosion potential and lower corrosion current density compared to the plain SiMnAl steel, demonstrating its superior corrosion resistance. Although the refined microstructure of the plain SiMnAl steel contributed to its corrosion resistance, this effect was substantially outweighed by the more pronounced improvement achieved through Cr alloying in the SiMnAl-CrNiMo steel.</p>

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Study on Corrosion Resistance of Plain High-Strength Bainite Steel in an Industrial Atmospheric Corrosion Environment

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Long Xiaoyan,
  • Wang Wanshuai,
  • Zhu Ranran,
  • Li Yingnan,
  • Yang Yan,
  • Tong Li,
  • Liu Yunda,
  • Li Yanguo,
  • Wang Yifei

摘要

Bainitic steel is widely studied and applied due to its high performance. Two types of bainitic steels were developed: one containing multiple alloying elements, designated as SiMnAl-CrNiMo steel, and the other, a lean alloyed steel composed only of Si, Mn, and Al, referred to as plain SiMnAl steel. A comparative study was carried out to evaluate their corrosion resistance in an industrial atmospheric environment. The research results revealed that the microstructure of both steels consists mainly of bainitic ferrite and retained austenite. And the plain SiMnAl steel has a lower content of retained austenite and finer microstructure characteristics than the SiMnAl-CrNiMo steel. Corrosion resistance tests shown that conventionally alloyed SiMnAl-CrNiMo steels have lower weight loss and weight loss rates than the plain SiMnAl steel. The thickness of the rust layer increases with prolonged corrosion time. Both types of steel exhibit iron oxides, Al(OH)3 and Al2O3 in their corrosion products. Cr2O3 was additionally identified in the SiMnAl-CrNiMo steel. It suggested that both Al and Cr contribute positively to the corrosion resistance. Polarization curve analysis revealed that the SiMnAl-CrNiMo steel exhibited both a higher corrosion potential and lower corrosion current density compared to the plain SiMnAl steel, demonstrating its superior corrosion resistance. Although the refined microstructure of the plain SiMnAl steel contributed to its corrosion resistance, this effect was substantially outweighed by the more pronounced improvement achieved through Cr alloying in the SiMnAl-CrNiMo steel.