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<p>The atmospheric corrosion behavior of 510L low alloy steel subjected to acid-cleaned surface (ACS) and eco-pickled surface (EPS) treatments is systematically examined. After 1&#xa0;year of atmospheric exposure, both ACS- and EPS-treated samples demonstrate protective ability index values exceeding 2, indicating robust protective properties of the developed rust layers. The corrosion rates of ACS- and EPS-treated samples are similar. During the initial corrosion stage, γ-FeOOH emerges as the dominant corrosion product. With the prolonged atmospheric exposure, γ-FeOOH content progressively decreases through phase transformation into thermodynamically stable α-FeOOH and densely structured Fe<sub>3</sub>O<sub>4</sub>, which markedly suppresses the corrosion of the steel. Notably, the corrosion rate of the coated EPS sample is obviously lower than that of the coated ACS counterpart, which is ascribed to the distinctive micro-roughness of EPS-treated surfaces that promote mechanical interlocking with protective coatings.</p>

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Effects of ACS and EPS treatments on corrosion behavior of 510L low alloy steel in atmospheric environments

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Shao-Hua Zhang,
  • Tian-Tian Bian,
  • Bao-Sheng Liu,
  • Peng-Fei Xu,
  • Xiao-Xia Ren,
  • Ying-Hui Wei,
  • Li-Feng Hou,
  • Peng-Peng Wu,
  • Yue-Zhong Zhang,
  • Fa-Cai Shi,
  • Cong-Ying Xu

摘要

The atmospheric corrosion behavior of 510L low alloy steel subjected to acid-cleaned surface (ACS) and eco-pickled surface (EPS) treatments is systematically examined. After 1 year of atmospheric exposure, both ACS- and EPS-treated samples demonstrate protective ability index values exceeding 2, indicating robust protective properties of the developed rust layers. The corrosion rates of ACS- and EPS-treated samples are similar. During the initial corrosion stage, γ-FeOOH emerges as the dominant corrosion product. With the prolonged atmospheric exposure, γ-FeOOH content progressively decreases through phase transformation into thermodynamically stable α-FeOOH and densely structured Fe3O4, which markedly suppresses the corrosion of the steel. Notably, the corrosion rate of the coated EPS sample is obviously lower than that of the coated ACS counterpart, which is ascribed to the distinctive micro-roughness of EPS-treated surfaces that promote mechanical interlocking with protective coatings.