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<p>The effect of trace Mg microalloying on corrosion initiation and long-term corrosion resistance of X70 steel is investigated. As a semiconductor, CaS cannot form a galvanic couple with the steel matrix. Trace Mg modifies the conductivity and thermal stability of inclusions, improving the localized corrosion resistance. Mg promotes the transformation to uniform corrosion and reduces the corrosion current density from 2.5 to 1.95 μA/cm<sup>2</sup>. Bivalent Mg compounds, such as MgO/Mg(OH)<sub>2</sub>, act as pH buffers and barriers at the steel/corrosion product interface, thus improving the protectiveness of rust layer. This work bridges the influence of Mg microalloying on corrosion initiation and long-term performance.</p>

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Exploring Trace Mg Microalloying Impact on Corrosion Mechanism of X70 Steel

  • 期刊论文

  • 发表日期：

    2025年6月22日

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  • Tianqi Chen,
  • Zhiyi Wang,
  • Qinglin Li,
  • Chao Liu,
  • Shasha Zhang,
  • Feng Huang,
  • Zhiyong Liu,
  • Xuequn Cheng,
  • Xiaogang Li

摘要

The effect of trace Mg microalloying on corrosion initiation and long-term corrosion resistance of X70 steel is investigated. As a semiconductor, CaS cannot form a galvanic couple with the steel matrix. Trace Mg modifies the conductivity and thermal stability of inclusions, improving the localized corrosion resistance. Mg promotes the transformation to uniform corrosion and reduces the corrosion current density from 2.5 to 1.95 μA/cm2. Bivalent Mg compounds, such as MgO/Mg(OH)2, act as pH buffers and barriers at the steel/corrosion product interface, thus improving the protectiveness of rust layer. This work bridges the influence of Mg microalloying on corrosion initiation and long-term performance.