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<p>Magnesium (Mg)-based alloys especially Mg–3Zn–0.3Ca are intensively studied for biodegradable orthopedic implant applications due to their good mechanical compatibility and biocompatibility. However, the direct use of Mg–3Zn–0.3Ca alloys in biodegradable implants is limited due to their rapid degradation and poor corrosion control in physiological environments. Therefore, to improve corrosion resistance&#xa0;alloy composition and processing parameters must be optimized. In this study, Mg–3Zn–0.3Ca–xY alloys (<i>x</i> = 0, 5, 10 and 15 wt.%) were stir cast to examine the effect of yttrium on microstructural evolution, mechanical response, and corrosion characteristics in simulated body fluid condition. FESEM, EDS and XRD were used to study the microstructure and phase composition of samples. The mechanical behavior was assessed using Brinell macrohardness test. The performance of corrosion was tested in simulated body fluid (SBF) by immersion and the degradation properties of surfaces were examined with AFM. Statistical design and optimization practices including Taguchi, ANOVA, and response surface methodology were employed to analyze the influence of yttrium content, immersion time, and solution pH on corrosion behavior and to design predictive models for biodegradable magnesium alloy design.</p>

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Experimental and Statistical Optimization of Yttrium-Modified Mg–3Zn–0.3Ca Alloys for Enhanced Corrosion Resistance and Surface Integrity

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • K. Aravinth,
  • S. Suresh

摘要

Magnesium (Mg)-based alloys especially Mg–3Zn–0.3Ca are intensively studied for biodegradable orthopedic implant applications due to their good mechanical compatibility and biocompatibility. However, the direct use of Mg–3Zn–0.3Ca alloys in biodegradable implants is limited due to their rapid degradation and poor corrosion control in physiological environments. Therefore, to improve corrosion resistance alloy composition and processing parameters must be optimized. In this study, Mg–3Zn–0.3Ca–xY alloys (x = 0, 5, 10 and 15 wt.%) were stir cast to examine the effect of yttrium on microstructural evolution, mechanical response, and corrosion characteristics in simulated body fluid condition. FESEM, EDS and XRD were used to study the microstructure and phase composition of samples. The mechanical behavior was assessed using Brinell macrohardness test. The performance of corrosion was tested in simulated body fluid (SBF) by immersion and the degradation properties of surfaces were examined with AFM. Statistical design and optimization practices including Taguchi, ANOVA, and response surface methodology were employed to analyze the influence of yttrium content, immersion time, and solution pH on corrosion behavior and to design predictive models for biodegradable magnesium alloy design.