Microstructural and Corrosion Behavior of Biodegradable Magnesium Alloys for Biomedical Implant

Abstract:

Magnesium and its alloys have great potential as biodegradable metallic implant materials with good mechanical properties. However, the poor corrosion rate and the production of hydrogen during degradation hindered its application. Binary alloy, Mg-3Ca and ternary alloy, Mg-3Ca-3Zn alloy were studied to investigate their bio-corrosion properties. Microstructure evolution and surfaces of corroded alloys were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The bio-corrosion behavior of the Mg alloys was investigated using immersion and electrochemical tests in Kokubo solution. Microstructural analysis showed that binary Mg-3Ca alloy consisted of α-Mg and Mg₂Ca phases and ternary Mg-3Ca-3Zn alloy consisted of α-Mg, Ca₂Mg₆Zn₃ and Mg₂Ca phases. These phases had significant effect on the corrosion resistant of the alloy. Electrochemical test showed an improvement in ternary alloys where the corrosion current density reduced from 0.497 mA/cm² in Mg-3Ca to 0.312 mA/cm² in Mg-3Ca-3Zn alloy. Ternary Mg-3Ca-3Zn showed significant lower corrosion rate (1.1 mg/cm²/day) compared to binary Mg-3Ca (5.8 mg/cm²/day) alloy after 14 days immersion test.

• Periodical: Materials Science Forum (Volume 819)
• Pages: 331-336
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.819.331
• Online since: June 2015
• Authors: H.Y. Tok, Esah Hamzah*, Hamid Reza Bakhsheshi-Rad
• Keywords: Biodegradable Implant, Corrosion Behavior, Magnesium Alloy

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