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<p>In this study, the mechanism of Zn element on microstructure evolution and corrosion resistance of Al-Cu-Mg alloy was systematically investigated. By means of scanning electron microscope (SEM) and transmission electron microscope (TEM) characterization, the regulation of microstructure of the alloy by trace Zn elements was revealed; and the corrosion behavior of the alloy was comprehensively evaluated by combining intergranular corrosion, exfoliation corrosion, and electrochemical tests. The results show that the addition of Zn element can significantly refine the grain of Al-Cu-Mg alloy and effectively inhibit the coarsening of θ′. The Al-4.5Cu-0.6&#xa0;Mg-0.4Zn (wt.%) alloy subjected to the heat treatment process (500&#xa0;°C/1&#xa0;h solid solution treatment + 200&#xa0;°C/4&#xa0;h aging treatment) showed the most excellent corrosion resistance, as indicated by the electrochemical parameters: charge transfer impedance (<i>R</i><sub><i>ct</i></sub>) up to 51,861&#xa0;Ω·cm<sup>2</sup>, and the corrosion current density (<i>i</i><sub><i>corr</i></sub>) as low as 7.97 × 10<sup>−4</sup>&#xa0;mA/cm<sup>2</sup>. Compared with the benchmark Al-4.5Cu-0.6&#xa0;Mg (wt.%) alloy, the corrosion resistance of the Al-4.5Cu-0.6&#xa0;Mg-0.4Zn (wt.%) alloy was enhanced by 38.6%, which provides an important theoretical basis for the development of high-strength and corrosion-resistant aluminum alloys.</p>

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Effect of Zn Content on Microstructure and Corrosion Resistance of Al-Cu-Mg Alloy

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Zhonghua Cui,
  • Lei Chen,
  • Ruiming Su

摘要

In this study, the mechanism of Zn element on microstructure evolution and corrosion resistance of Al-Cu-Mg alloy was systematically investigated. By means of scanning electron microscope (SEM) and transmission electron microscope (TEM) characterization, the regulation of microstructure of the alloy by trace Zn elements was revealed; and the corrosion behavior of the alloy was comprehensively evaluated by combining intergranular corrosion, exfoliation corrosion, and electrochemical tests. The results show that the addition of Zn element can significantly refine the grain of Al-Cu-Mg alloy and effectively inhibit the coarsening of θ′. The Al-4.5Cu-0.6 Mg-0.4Zn (wt.%) alloy subjected to the heat treatment process (500 °C/1 h solid solution treatment + 200 °C/4 h aging treatment) showed the most excellent corrosion resistance, as indicated by the electrochemical parameters: charge transfer impedance (Rct) up to 51,861 Ω·cm2, and the corrosion current density (icorr) as low as 7.97 × 10−4 mA/cm2. Compared with the benchmark Al-4.5Cu-0.6 Mg (wt.%) alloy, the corrosion resistance of the Al-4.5Cu-0.6 Mg-0.4Zn (wt.%) alloy was enhanced by 38.6%, which provides an important theoretical basis for the development of high-strength and corrosion-resistant aluminum alloys.