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<p>The corrosion resistance of Q420qNH weathering steel was studied after pre-corrosion stabilization using different rust stabilizers and 3&#xa0;months of industrial atmospheric exposure. XRD, SEM, and electrochemical techniques were applied to evaluate the rust layers. The stabilizers used were the sulfate-type stabilizer (Group A: CuSO<sub>4</sub>−FeSO<sub>4</sub>−NaHSO<sub>3</sub>-0.3–0.8%Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>) and the precipitation-type stabilizer (Group B: CuSO<sub>4</sub>−FeSO<sub>4</sub>−NaHSO<sub>3</sub>-Na<sub>2</sub>HPO<sub>4</sub>). Stabilized samples showed a higher initial corrosion rate that promoted rapid rust layer formation, followed by a reduced corrosion rate and fewer defects. Both untreated and treated rust layers mainly consisted of <i>α</i>-FeOOH, <i>γ</i>-FeOOH, <i>β</i>-FeOOH, and Fe<sub>3</sub>O<sub>4</sub>/<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> phases. Stabilization increased the protective <i>α</i>-FeOOH content, with the B group reaching 24% and an <i>α</i>/<i>γ</i>* ratio of 0.32, compared to 0.11 for bare steel. The B group exhibited the most compact rust layer, the highest self-corrosion potential (by + 0.12&#xa0;V), the lowest self-corrosion current density (by − 0.65&#xa0;mA&#xa0;cm<sup>−2</sup>), and the highest rust layer resistance (+120.1&#xa0;Ω&#xa0;cm<sup>2</sup>), outperforming the A group and bare steel. The B group solution showed the best protection under a simulated industrial atmosphere.</p>

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Effect of Stabilization Treatment on Rust Layer of Q420qNH Weathering Steel Under Outdoor Exposure

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Jianjun Yang,
  • Zhen Ren,
  • Caihe Fan,
  • Ming Fan,
  • Qing Gao,
  • Wenhao Zhou,
  • Qijiang Lu,
  • Qian Chen,
  • Hongyan Guo,
  • Tao Tao,
  • Kangwei Zhao,
  • Xiao Zhang

摘要

The corrosion resistance of Q420qNH weathering steel was studied after pre-corrosion stabilization using different rust stabilizers and 3 months of industrial atmospheric exposure. XRD, SEM, and electrochemical techniques were applied to evaluate the rust layers. The stabilizers used were the sulfate-type stabilizer (Group A: CuSO4−FeSO4−NaHSO3-0.3–0.8%Cr2(SO4)3) and the precipitation-type stabilizer (Group B: CuSO4−FeSO4−NaHSO3-Na2HPO4). Stabilized samples showed a higher initial corrosion rate that promoted rapid rust layer formation, followed by a reduced corrosion rate and fewer defects. Both untreated and treated rust layers mainly consisted of α-FeOOH, γ-FeOOH, β-FeOOH, and Fe3O4/γ-Fe2O3 phases. Stabilization increased the protective α-FeOOH content, with the B group reaching 24% and an α/γ* ratio of 0.32, compared to 0.11 for bare steel. The B group exhibited the most compact rust layer, the highest self-corrosion potential (by + 0.12 V), the lowest self-corrosion current density (by − 0.65 mA cm−2), and the highest rust layer resistance (+120.1 Ω cm2), outperforming the A group and bare steel. The B group solution showed the best protection under a simulated industrial atmosphere.