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<p>In response to the application demands of biodegradable zinc alloys in the field of bone repair, this study prepared Zn-1&#xa0;Mg, Zn-2&#xa0;Mg, and Zn-1&#xa0;Mg-1Cu alloys with pore diameters of 1&#xa0;mm and 2&#xa0;mm through vacuum infiltration casting. A systematic investigation was conducted to examine the effects of pore diameter and alloy composition on microstructure, mechanical strength, and degradation kinetics. The results indicate that the degradation mechanism primarily involves galvanic corrosion between the η-Zn matrix and intermetallic compounds (Mg<sub>2</sub>Zn<sub>11</sub>, MgZn<sub>2</sub>). The degradation products, predominantly Zn<sub>5</sub>(OH)<sub>8</sub>Cl<sub>2</sub>, preferentially form at the edges of the pores and within the cavities, with trace amounts of Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub> and CaZn<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub> detected, suggesting potential bioactivity. During the initial degradation phase, the 1&#xa0;mm pore diameter samples exhibited a faster corrosion rate due to their larger surface area, while the 2&#xa0;mm pore diameter samples accelerated degradation in later stages driven by an increased content of the second phase (up to 0.15&#xa0;mm/a for Zn-2&#xa0;Mg). Furthermore, all alloys demonstrated compressive strength and elastic modulus that meet the requirements for human trabecular bone. This work provides significant insights for the design of biodegradable Zn alloys with tunable degradation profiles for orthopedic applications.</p>

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Synergistic Regulation of Porosity and Composition in Porous Biodegradable Zinc Alloys: Degradation and Mechanical Properties in Bone Repair

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Zeming Wang,
  • Qiang Xu,
  • Xiaotong Lu,
  • Jin Chen,
  • Zhuyue Zhang,
  • Zhongyi Cui,
  • Lixing Zhang,
  • Lisi Liang

摘要

In response to the application demands of biodegradable zinc alloys in the field of bone repair, this study prepared Zn-1 Mg, Zn-2 Mg, and Zn-1 Mg-1Cu alloys with pore diameters of 1 mm and 2 mm through vacuum infiltration casting. A systematic investigation was conducted to examine the effects of pore diameter and alloy composition on microstructure, mechanical strength, and degradation kinetics. The results indicate that the degradation mechanism primarily involves galvanic corrosion between the η-Zn matrix and intermetallic compounds (Mg2Zn11, MgZn2). The degradation products, predominantly Zn5(OH)8Cl2, preferentially form at the edges of the pores and within the cavities, with trace amounts of Ca10(PO4)6(OH)2 and CaZn2(PO4)2 detected, suggesting potential bioactivity. During the initial degradation phase, the 1 mm pore diameter samples exhibited a faster corrosion rate due to their larger surface area, while the 2 mm pore diameter samples accelerated degradation in later stages driven by an increased content of the second phase (up to 0.15 mm/a for Zn-2 Mg). Furthermore, all alloys demonstrated compressive strength and elastic modulus that meet the requirements for human trabecular bone. This work provides significant insights for the design of biodegradable Zn alloys with tunable degradation profiles for orthopedic applications.