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<p>The morphologies, microdefects, electrochemical corrosions and pitting corrosion processes of two types of inclusions in the rebar were characterized using FE-SEM, EBSD, SKPFM, CSAFM and electrochemical tests. These experimental results, combined with E-pH analysis and first-principles calculations, were employed to analyze the pitting corrosion mechanism. The experimental results indicated that the inclusions in the CS rebar were mainly Al<sub>2</sub>O<sub>3</sub>, with an average size of approximately 1.6&#xa0;<i>μ</i>m, while the nitrides in the micro-alloyed rebar were mainly NbN, VN, TiN, with sizes ranging from 2.1 to 2.3&#xa0;<i>μ</i>m. In the early corrosion stages, the large lattice deformations and high-density dislocations primarily occurred at the Al<sub>2</sub>O<sub>3</sub> inclusion/rebar matrix interfaces, thus promoting the micro-dissolution of rebar matrix and the formation of micro-pits. In contrast, the small lattice deformations and low-density dislocations were mainly observed at the nitride (NbN, VN, TiN)/rebar matrix interfaces, leading to the galvanic corrosion formation of between the two, which was not sufficient to initiate the pitting corrosion process. The first-principles calculations combined with corrosion experiments have been confirmed that the pitting corrosion tendency of various inclusions can be summarized as follows: Al<sub>2</sub>O<sub>3</sub> &gt; microalloying element nitrides (TiN &gt; VN &gt; NbN).</p>

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Research on Pitting Corrosion Induced by Al2O3 and Microalloying Element Nitrides in Micro-alloyed Rebar

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Zeyun Zeng,
  • Shangjun Gu,
  • Jie Wang,
  • Fulong Wei,
  • Xiang Xie,
  • Zhiying Li,
  • Hui Yang,
  • Changrong Li

摘要

The morphologies, microdefects, electrochemical corrosions and pitting corrosion processes of two types of inclusions in the rebar were characterized using FE-SEM, EBSD, SKPFM, CSAFM and electrochemical tests. These experimental results, combined with E-pH analysis and first-principles calculations, were employed to analyze the pitting corrosion mechanism. The experimental results indicated that the inclusions in the CS rebar were mainly Al2O3, with an average size of approximately 1.6 μm, while the nitrides in the micro-alloyed rebar were mainly NbN, VN, TiN, with sizes ranging from 2.1 to 2.3 μm. In the early corrosion stages, the large lattice deformations and high-density dislocations primarily occurred at the Al2O3 inclusion/rebar matrix interfaces, thus promoting the micro-dissolution of rebar matrix and the formation of micro-pits. In contrast, the small lattice deformations and low-density dislocations were mainly observed at the nitride (NbN, VN, TiN)/rebar matrix interfaces, leading to the galvanic corrosion formation of between the two, which was not sufficient to initiate the pitting corrosion process. The first-principles calculations combined with corrosion experiments have been confirmed that the pitting corrosion tendency of various inclusions can be summarized as follows: Al2O3 > microalloying element nitrides (TiN > VN > NbN).