Fabrication of Al₂O₃ Ceramic Coating on AZ91 Biomedical Magnesium Alloy and the Corrosion Resistance in SBF

Abstract:

Al₂O₃ ceramic coating was fabricated on AZ91 biomedical magnesium alloy by plasma electrolytic oxidation. The microstructure of the coatings was characterized. The corrosion behavior of the coated magnesium alloy in simulated body fluids (SBF) was evaluated. The results showed that the as prepared coating was composed of crystal Al₂O₃, including much α-Al₂O₃ and some γ-Al₂O₃. The Al₂O_3. coating showed porous surface and the biggest diameters of the holes were about 6-7 um, and the smallest were about 1 um. The corrosion tests in SBF indicated that corrosion resistance of Al₂O₃ coated sample was significantly improved compared to the uncoated sample.

• Periodical: Applied Mechanics and Materials (Volumes 365-366)
• Pages: 1114-1117
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.365-366.1114
• Online since: August 2013
• Authors: Yun Long Wang, Shuo Wang, Miao Wang, Li Jie Shi, Hui Rong Guo, Zi Juan He, Xing Feng Shi
• Keywords: Al₂O₃, Biomedical Magnesium Alloy, Ceramic Coating, Plasma Electrolytic Oxidation

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