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<p>In this paper, the simulated industrial atmosphere corrosion behaviors of two types of 690&#xa0;MPa medium Mn steels and a 690&#xa0;MPa weathering modulated steel were thoroughly investigated using alternate immersion test. The corrosion rate, from high to low, was 4.5Mn-DQT, 1.6Mn-QT, and 3.9Mn-DQT. Mn is enriched on the surface of rust layers in some specimens, and the content has exceeded that of the matrix, because Mn first dissolves during the corrosion process. Cr are enriched in the rust layer of 3.9Mn-DQT and 1.6Mn-QT on the side close to the matrix, and the content has also exceeded that of the matrix, because the oxide formed by Cr is stable. Uneven rapid corrosion zones were found in the rust layer of 3.9Mn-DQT and 1.6Mn-QT, and the uneven corrosion of 1.6Mn-QT is significantly greater than that of 3.9Mn-DQT. The most possible reason for this phenomenon is the presence of carbides in these two experimental steels. To enhance the corrosion resistance of medium Mn steel with martensite and austenite microstructures, the Mn content should be controlled to minimize it as much as possible, while ensuring the acquisition of a sufficient and stable of RA. Resistance to corrosion increases with Cr content within the range where no carbides form.</p>

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Investigation on the Corrosion Behavior of Q690 Medium Mn Steel in Simulated Industrial Atmosphere: Design Consideration for Improving the Corrosion Resistance of Medium Mn Steel

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Y. Du,
  • T. Liu,
  • C. Sun,
  • Z. W. Du,
  • X. H. Gao,
  • H. Y. Wu,
  • L. H. Chen,
  • L. X. Du

摘要

In this paper, the simulated industrial atmosphere corrosion behaviors of two types of 690 MPa medium Mn steels and a 690 MPa weathering modulated steel were thoroughly investigated using alternate immersion test. The corrosion rate, from high to low, was 4.5Mn-DQT, 1.6Mn-QT, and 3.9Mn-DQT. Mn is enriched on the surface of rust layers in some specimens, and the content has exceeded that of the matrix, because Mn first dissolves during the corrosion process. Cr are enriched in the rust layer of 3.9Mn-DQT and 1.6Mn-QT on the side close to the matrix, and the content has also exceeded that of the matrix, because the oxide formed by Cr is stable. Uneven rapid corrosion zones were found in the rust layer of 3.9Mn-DQT and 1.6Mn-QT, and the uneven corrosion of 1.6Mn-QT is significantly greater than that of 3.9Mn-DQT. The most possible reason for this phenomenon is the presence of carbides in these two experimental steels. To enhance the corrosion resistance of medium Mn steel with martensite and austenite microstructures, the Mn content should be controlled to minimize it as much as possible, while ensuring the acquisition of a sufficient and stable of RA. Resistance to corrosion increases with Cr content within the range where no carbides form.