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<p>Mg-Zn-Ca alloys are attractive biodegradable metals but suffer from accelerated degradation and limited antibacterial functionality under physiological environments. Here, minor Ag additions (0, 0.1, 0.3 and 0.5 wt.%) were introduced into an as-cast Mg-2Zn-0.2Ca alloy to regulate degradation behavior and antibacterial performance. Electrochemical and immersion results show that 0.1 wt.% Ag stabilizes the corrosion product layer, suppresses localized degradation, and reduces the corrosion rate to 0.12 ± 0.02 mm/year. Increasing Ag content progressively enhances antibacterial activity against <i>Escherichia coli</i> and <i>Staphylococcus aureus</i>, with antibacterial efficiencies rising from 61.4 ± 3.9% (Ag-free) to 89.6 ± 3.0% at 0.1 wt.% Ag and exceeding 99% at 0.3-0.5 wt.% Ag. The improved antibacterial performance correlates with increased Ag<sup>+</sup> release during degradation, while excessive Ag promotes micro-galvanic effects that accelerate corrosion. These results elucidate the competing roles of Ag in governing degradation kinetics and antibacterial efficacy, providing useful insight for designing multifunctional biodegradable Mg alloys.</p>

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Bulk Ag addition reduces biodegradation and enhances antibacterial properties of Mg-2Zn-0.2Ca alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月15日

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  • Fang Yi,
  • Meng-Zhi Wu,
  • Yi Chen,
  • Lingzhi Yang,
  • Jing Guo,
  • Yonghao Gao

摘要

Mg-Zn-Ca alloys are attractive biodegradable metals but suffer from accelerated degradation and limited antibacterial functionality under physiological environments. Here, minor Ag additions (0, 0.1, 0.3 and 0.5 wt.%) were introduced into an as-cast Mg-2Zn-0.2Ca alloy to regulate degradation behavior and antibacterial performance. Electrochemical and immersion results show that 0.1 wt.% Ag stabilizes the corrosion product layer, suppresses localized degradation, and reduces the corrosion rate to 0.12 ± 0.02 mm/year. Increasing Ag content progressively enhances antibacterial activity against Escherichia coli and Staphylococcus aureus, with antibacterial efficiencies rising from 61.4 ± 3.9% (Ag-free) to 89.6 ± 3.0% at 0.1 wt.% Ag and exceeding 99% at 0.3-0.5 wt.% Ag. The improved antibacterial performance correlates with increased Ag+ release during degradation, while excessive Ag promotes micro-galvanic effects that accelerate corrosion. These results elucidate the competing roles of Ag in governing degradation kinetics and antibacterial efficacy, providing useful insight for designing multifunctional biodegradable Mg alloys.