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<p>Hot-dip galvanized products are widely used in various fields of production and daily life due to their excellent corrosion resistance. Some studies have incorporated a fourth trace alloying element into Zn-Al-Mg coatings to form quaternary alloys for enhanced performance. In this work, three Zn-Al-Mg alloy ingots with trace Bi/Sb additions were prepared by induction melting, with compositions of Zn1.5Al1.0Mg1.0Bi, Zn1.5Al1.0Mg1.0Sb, and Zn1.5Al1.0&#xa0;Mg, respectively. Melting was conducted in a heating furnace under an argon-protected atmosphere to obtain solidified microstructures. The solidification microstructure and corrosion behavior of Zn-Al-Mg alloys with Bi/Sb additions were investigated via microstructure characterization, electrochemical tests, and immersion experiments. Basic calculations were performed to predict the properties of Bi/Sb-added Zn-Al-Mg alloys. The microstructure and phase composition of the alloys were analyzed using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). Electrochemical Tafel curves and Nyquist plots of Zn-Al-Mg alloys with different Bi/Sb contents showed that, with the addition of Bi/Sb, the corrosion current density decreased while the impedance value increased, indicating that the corrosion resistance of Zn-Al-Mg alloys was improved by Bi/Sb additions. The precipitation of Bi<sub>2</sub>Mg<sub>3</sub> and Mg<sub>3</sub>Sb<sub>2</sub> phases was identified through EBSD diffraction analysis, and the morphology and distribution of these precipitated phases were studied.</p>

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Enhanced Corrosion Resistance and Phase Precipitation in Bi/Sb-Modified Zn-Al-Mg Alloys: Microstructural Evolution and Electrochemical Behavior

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Guanghui Liu,
  • Huaxiang Teng,
  • Yun Han,
  • Guangrui Jiang,
  • Chengliang Xu,
  • Musheng Qiu,
  • Ting Shang,
  • Peng Guo

摘要

Hot-dip galvanized products are widely used in various fields of production and daily life due to their excellent corrosion resistance. Some studies have incorporated a fourth trace alloying element into Zn-Al-Mg coatings to form quaternary alloys for enhanced performance. In this work, three Zn-Al-Mg alloy ingots with trace Bi/Sb additions were prepared by induction melting, with compositions of Zn1.5Al1.0Mg1.0Bi, Zn1.5Al1.0Mg1.0Sb, and Zn1.5Al1.0 Mg, respectively. Melting was conducted in a heating furnace under an argon-protected atmosphere to obtain solidified microstructures. The solidification microstructure and corrosion behavior of Zn-Al-Mg alloys with Bi/Sb additions were investigated via microstructure characterization, electrochemical tests, and immersion experiments. Basic calculations were performed to predict the properties of Bi/Sb-added Zn-Al-Mg alloys. The microstructure and phase composition of the alloys were analyzed using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). Electrochemical Tafel curves and Nyquist plots of Zn-Al-Mg alloys with different Bi/Sb contents showed that, with the addition of Bi/Sb, the corrosion current density decreased while the impedance value increased, indicating that the corrosion resistance of Zn-Al-Mg alloys was improved by Bi/Sb additions. The precipitation of Bi2Mg3 and Mg3Sb2 phases was identified through EBSD diffraction analysis, and the morphology and distribution of these precipitated phases were studied.