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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.

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Title: Al2O3-Incorporated Surface Modification of Magnesium Alloy AZ-31B Using Dual-Mode AC/DC Plasma Electrolytic Oxidation to Enhance Corrosion Resistance for Biomedical Applications.
Authors: Rizwan, Muhammad1 (AUTHOR) materialist.riz@gmail.com, Habib, Syed1 (AUTHOR), Ali, Muhammad1 (AUTHOR), Uzair, Syed Ahmed2 (AUTHOR), Sultan, Muhammad Taha3 (AUTHOR), Alias, Rodianah4 (AUTHOR), Darain, Syed Ahmed1 (AUTHOR), Saeed, Talal1 (AUTHOR), Ali, Wamiq1 (AUTHOR), Chandio, Ali Dad1 (AUTHOR)
Source: JOM: The Journal of The Minerals, Metals & Materials Society (TMS). Jun2026, Vol. 78 Issue 6, p5327-5340. 14p.
Subjects: Aluminum oxide, Corrosion resistance, Surface properties, Magnesium alloys, Artificial implants, Surface preparation, Wear resistance, Electrolytic oxidation
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of JOM: The Journal of The Minerals, Metals & Materials Society (TMS) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract: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. [ABSTRACT FROM AUTHOR]
ISSN:10474838
DOI:10.1007/s11837-026-08276-8