Biodegradable behaviors of AZ31 magnesium alloy in simulated body fluid |
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Authors: | Yingwei Song Dayong Shan Rongshi Chen Fan Zhang En-Hou Han |
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Affiliation: | State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang, 110016, China;Clemson University, Charleston, South Carolina 29425 USA;University of Cincinnati, Cincinnati, Ohio 45221, USA |
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Abstract: | Magnesium alloys have unique advantages to act as biodegradable implants for clinical application. The biodegradable behaviors of AZ31 in simulated body fluid (SBF) for various immersion time intervals were investigated by electrochemical impedance spectroscopy (EIS) tests and scanning electron microscope (SEM) observation, and then the biodegradable mechanisms were discussed. It was found that a protective film layer was formed on the surface of AZ31 in SBF. With increasing of immersion time, the film layer became more compact. If the immersion time was more than 24 h, the film layer began to degenerate and emerge corrosion pits. In the meantime, there was hydroxyapatite particles deposited on the film layer. The hydroxyapatite is the essential component of human bone, which indicates the perfect biocompatibility of AZ31 magnesium alloy. |
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