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<p>Zinc (Zn) is utilized for biodegradable implants due to its desirable characteristics and biocompatibility. Processing Zn through high-pressure torsion (HPT) results in grain refinement and increased strength. Plasma electrolytic oxidation (PEO) is an electrochemical surface treatment that results in a natural ceramic-like coating that can decrease the corrosion rate and increase both the wear resistance and biocompatibility of the substrate it is applied to. This treatment can alter the porosity, thickness, and morphology of the coating through variations in the voltage or current density, duration of treatment, and composition of the electrolyte. The primary objective of this study was to investigate the effects of PEO on the corrosion behavior of Zn–3Mg (wt%), Zn–10Mg (wt%), and Zn–30Mg (wt%) substrates that were processed using HPT. PEO-coated samples of each composition were investigated using various characterization techniques involving scanning electron microscopy, wettability, surface energy, corrosion resistance, and biocompatibility. The PEO-coated materials outperformed the uncoated substrates in terms of their biological response, and Zn–3Mg(wt%) showed superior results when compared to Zn–10Mg (wt%) and Zn–30Mg(wt%). In particular, the results indicated that the PEO coatings significantly improved the corrosion resistance for all the substrates, and the PEO-coated Zn–3Mg (wt%) alloy exhibited the most attractive behavior for biomedical applications.</p>

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The Effect of Plasma Electrolytic Oxidation on the Corrosion Behavior of Zn–Mg Alloys Processed Using High-Pressure Torsion

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Jessica Salinas,
  • Nafiseh Mollaei,
  • Carl J. Boehlert,
  • Mónica Echeverry-Rendón

摘要

Zinc (Zn) is utilized for biodegradable implants due to its desirable characteristics and biocompatibility. Processing Zn through high-pressure torsion (HPT) results in grain refinement and increased strength. Plasma electrolytic oxidation (PEO) is an electrochemical surface treatment that results in a natural ceramic-like coating that can decrease the corrosion rate and increase both the wear resistance and biocompatibility of the substrate it is applied to. This treatment can alter the porosity, thickness, and morphology of the coating through variations in the voltage or current density, duration of treatment, and composition of the electrolyte. The primary objective of this study was to investigate the effects of PEO on the corrosion behavior of Zn–3Mg (wt%), Zn–10Mg (wt%), and Zn–30Mg (wt%) substrates that were processed using HPT. PEO-coated samples of each composition were investigated using various characterization techniques involving scanning electron microscopy, wettability, surface energy, corrosion resistance, and biocompatibility. The PEO-coated materials outperformed the uncoated substrates in terms of their biological response, and Zn–3Mg(wt%) showed superior results when compared to Zn–10Mg (wt%) and Zn–30Mg(wt%). In particular, the results indicated that the PEO coatings significantly improved the corrosion resistance for all the substrates, and the PEO-coated Zn–3Mg (wt%) alloy exhibited the most attractive behavior for biomedical applications.