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<p>Zn-3.5Al-1.5Cu-xFe (x = 0,0.1,0.3) alloys were prepared by metal mold casting. The effect of Fe addition on the microstructure, corrosion behavior in 3.5&#xa0;wt.% NaCl solution and simulated body fluid, and mechanical properties of Zn-3.5Al-1.5Cu alloys were systematically investigated. The results revealed that the microstructures predominantly consisted of the η phase (Zn solid solution) and α (Al) + η eutectic. Fe addition refined the grain size of η phase, reduced its volume fraction, and led to the formation of (Fe, Al) Zn<sub>13</sub> intermetallic compounds. The microhardness increased with Fe content. The tensile strength rose from 269&#xa0;MPa (0.1&#xa0;wt.% Fe) to 284&#xa0;MPa (0.3&#xa0;wt.% Fe). The Zn-3.5Al-1.5Cu-0.1Fe alloy exhibited the highest elongation (2.8%), representing a 55.56% improvement over the Fe-free alloy. Fracture analysis indicated predominantly cleavage fracture. Electrochemical testing and immersion testing demonstrated that Fe addition reduced the corrosion rate. Specifically, the alloy adding 0.1&#xa0;wt.% Fe exhibited the lowest self-corrosion current density (5.855&#xa0;μA&#xa0;cm<sup>−2</sup>) and corrosion rate (74 ± 3&#xa0;μm&#xa0;year<sup>−1</sup>) in electrochemical test.</p>

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Effect of Fe Addition on the Microstructure, Corrosion Behavior, and Mechanical Properties of Zn-3.5Al-1.5Cu Alloy for Biomedical Application

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Yan Zhang,
  • Hongxing Wang,
  • Hong Cai,
  • Tao Zhou,
  • Hao Cao,
  • Kairun Huang

摘要

Zn-3.5Al-1.5Cu-xFe (x = 0,0.1,0.3) alloys were prepared by metal mold casting. The effect of Fe addition on the microstructure, corrosion behavior in 3.5 wt.% NaCl solution and simulated body fluid, and mechanical properties of Zn-3.5Al-1.5Cu alloys were systematically investigated. The results revealed that the microstructures predominantly consisted of the η phase (Zn solid solution) and α (Al) + η eutectic. Fe addition refined the grain size of η phase, reduced its volume fraction, and led to the formation of (Fe, Al) Zn13 intermetallic compounds. The microhardness increased with Fe content. The tensile strength rose from 269 MPa (0.1 wt.% Fe) to 284 MPa (0.3 wt.% Fe). The Zn-3.5Al-1.5Cu-0.1Fe alloy exhibited the highest elongation (2.8%), representing a 55.56% improvement over the Fe-free alloy. Fracture analysis indicated predominantly cleavage fracture. Electrochemical testing and immersion testing demonstrated that Fe addition reduced the corrosion rate. Specifically, the alloy adding 0.1 wt.% Fe exhibited the lowest self-corrosion current density (5.855 μA cm−2) and corrosion rate (74 ± 3 μm year−1) in electrochemical test.