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<p>Biodegradable zinc alloys are promising candidates for orthopaedic implants, eliminating the need for secondary removal surgery. However, their clinical adoption is hindered by insufficient mechanical strength. This study investigates the effects Fe, Cu, and Mn additions (0.5wt%) on the microstructure, mechanical properties, and corrosion behaviour of a Zn-1Mg base alloy fabricated by powder metallurgy. Microstructural and phase analysis using optical microscopy, scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS), and X-ray diffraction (XRD) revealed that all alloying elements enhanced strength, with the Zn-1Mg-0.5Fe composition showing significant grain refinement compared to the base Zn-1Mg alloy. Electrochemical and immersion tests in simulated body fluid showed that the Zn-1Mg-0.5Cu alloy exhibited a notably low corrosion rate of 0.08&#xa0;mm/year, less than half that of the base Zn-1Mg alloy. The Zn-1Mg-0.5Fe alloy presented the most favourable combination of mechanical strength and suitable corrosion rate, positioning it as a highly promising biodegradable material for load-bearing implant applications.</p> Graphical abstract <p></p>

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Effect of Fe, Cu and Mn on the Microstructure, Mechanical Properties and Corrosion of a Biodegradable Zn-Mg Alloy

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Chems Eddine Ramoul,
  • Amel Gharbi,
  • Oualid Ghelloudj,
  • Ali Ourdjini,
  • Nasser Eddine Beliardouh

摘要

Biodegradable zinc alloys are promising candidates for orthopaedic implants, eliminating the need for secondary removal surgery. However, their clinical adoption is hindered by insufficient mechanical strength. This study investigates the effects Fe, Cu, and Mn additions (0.5wt%) on the microstructure, mechanical properties, and corrosion behaviour of a Zn-1Mg base alloy fabricated by powder metallurgy. Microstructural and phase analysis using optical microscopy, scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS), and X-ray diffraction (XRD) revealed that all alloying elements enhanced strength, with the Zn-1Mg-0.5Fe composition showing significant grain refinement compared to the base Zn-1Mg alloy. Electrochemical and immersion tests in simulated body fluid showed that the Zn-1Mg-0.5Cu alloy exhibited a notably low corrosion rate of 0.08 mm/year, less than half that of the base Zn-1Mg alloy. The Zn-1Mg-0.5Fe alloy presented the most favourable combination of mechanical strength and suitable corrosion rate, positioning it as a highly promising biodegradable material for load-bearing implant applications.

Graphical abstract