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<p>Magnesium alloys are promising for biomedical implants because of their strength-to-weight ratio and biocompatibility, but rapid corrosion limits their use. The plasma electrolytic oxidation (PEO) process may improve corrosion resistance, making these alloys more viable for implants. PEO of AZ31B magnesium alloy is one of the most effective methods for producing an exceptionally dense barrier oxide film. In this work, the electrolytes used to prepare dual-mode AC/DC PEO coatings consisted of an alkaline solution (NaOH + Na<sub>2</sub>SiO<sub>3</sub>) with and without added alumina (Al<sub>2</sub>O<sub>3</sub>) microparticles. Scanning electron microscopy and energy-dispersive x-ray spectroscopy were used to determine surface morphology and elemental composition. In contrast, laser particle size analysis was used to evaluate particle size distribution. Corrosion resistance was assessed using potentiodynamic polarization measurements; adhesion strength and wear resistance were examined using scratch and surface roughness testing. The results show that the coating formed in the silicate electrolyte exhibits a dense structure, low thickness, and limited corrosion resistance. However, the Al<sub>2</sub>O<sub>3</sub> additive primarily participated in forming the ceramic coating and reducing porosity. Notably, adding the Al<sub>2</sub>O<sub>3</sub> additive increased coating thickness and corrosion resistance, and improved coating adhesion strength.</p>

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Al2O3-Incorporated Surface Modification of Magnesium Alloy AZ-31B Using Dual-Mode AC/DC Plasma Electrolytic Oxidation to Enhance Corrosion Resistance for Biomedical Applications

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Muhammad Rizwan,
  • Syed Habib,
  • Muhammad Ali,
  • Syed Ahmed Uzair,
  • Muhammad Taha Sultan,
  • Rodianah Alias,
  • Syed Ahmed Darain,
  • Talal Saeed,
  • Wamiq Ali,
  • Ali Dad Chandio

摘要

Magnesium alloys are promising for biomedical implants because of their strength-to-weight ratio and biocompatibility, but rapid corrosion limits their use. The plasma electrolytic oxidation (PEO) process may improve corrosion resistance, making these alloys more viable for implants. PEO of AZ31B magnesium alloy is one of the most effective methods for producing an exceptionally dense barrier oxide film. In this work, the electrolytes used to prepare dual-mode AC/DC PEO coatings consisted of an alkaline solution (NaOH + Na2SiO3) with and without added alumina (Al2O3) microparticles. Scanning electron microscopy and energy-dispersive x-ray spectroscopy were used to determine surface morphology and elemental composition. In contrast, laser particle size analysis was used to evaluate particle size distribution. Corrosion resistance was assessed using potentiodynamic polarization measurements; adhesion strength and wear resistance were examined using scratch and surface roughness testing. The results show that the coating formed in the silicate electrolyte exhibits a dense structure, low thickness, and limited corrosion resistance. However, the Al2O3 additive primarily participated in forming the ceramic coating and reducing porosity. Notably, adding the Al2O3 additive increased coating thickness and corrosion resistance, and improved coating adhesion strength.