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<p>To investigate the weather resistance of titanium-doped steels under varying Cl<sup>–</sup> concentrations, cyclic corrosion tests were conducted using NaCl solutions with different concentrations. The experimental results demonstrate that after etching in a 0.1–2&#xa0;wt&#xa0;pct NaCl solution for 240&#xa0;hours, titanium not only facilitates the formation of <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>, but the generated TiO<sub>2</sub> also enhances nucleation sites, resulting in a more compact product layer. However, in 3.5&#xa0;wt&#xa0;pct NaCl solution, excessive Cl<sup>–</sup> concentrations continuously dissolved iron oxides in the product layer. High Cl<sup>–</sup> content also significantly promotes the formation of <i>γ</i>-FeOOH and Fe<sub>3</sub>O<sub>4</sub>, while suppressing <i>α</i>-FeOOH generation. Ti exhibited limited improvement on the product layer and failed to effectively promote protective layer formation under high Cl<sup>–</sup> conditions.</p>

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The Influence of Chloride Ion Concentration on the Product Layer of Ti Microalloy Steel Under Simulated Marine Atmospheric Conditions

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Jie Hu,
  • Chuang-wei Wang,
  • Charles Witness Siyasiya,
  • Zheng-hua Tang

摘要

To investigate the weather resistance of titanium-doped steels under varying Cl– concentrations, cyclic corrosion tests were conducted using NaCl solutions with different concentrations. The experimental results demonstrate that after etching in a 0.1–2 wt pct NaCl solution for 240 hours, titanium not only facilitates the formation of γ-Fe2O3, but the generated TiO2 also enhances nucleation sites, resulting in a more compact product layer. However, in 3.5 wt pct NaCl solution, excessive Cl– concentrations continuously dissolved iron oxides in the product layer. High Cl– content also significantly promotes the formation of γ-FeOOH and Fe3O4, while suppressing α-FeOOH generation. Ti exhibited limited improvement on the product layer and failed to effectively promote protective layer formation under high Cl– conditions.