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Materials 2017, 10(8), 855; https://doi.org/10.3390/ma10080855

Effect of Hydroxyapatite on the Mechanical Properties and Corrosion Behavior of Mg-Zn-Y Alloy

1
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
2
Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
3
Department of Dentistry, Cathay General Hospital, Taipei 106, Taiwan
4
Department of Dentistry, Taipei Medical University-Shuang Ho Hospital, New Taipei City 235, Taiwan
5
3D Global Biotech Inc., New Taipei City 221, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Juergen Stampfl
Received: 10 June 2017 / Revised: 20 July 2017 / Accepted: 21 July 2017 / Published: 26 July 2017
(This article belongs to the Section Biomaterials)
View Full-Text   |   Download PDF [8504 KB, uploaded 26 July 2017]   |  

Abstract

Mg-Zn-Y alloys with a long period stacking ordered (LPSO) phase are potential candidates for biodegradable implants; however, an unfavorable degradation rate has limited their applications. Hydroxyapatite (HA) has been shown to enhance the corrosion resistance of Mg alloys. In this study, Mg97Zn1Y2-0.5 wt% HA composite was synthesized and solution treated at 500 °C for 10 h. The corrosion behavior of the composite was studied by electrochemical and immersion tests, while the mechanical properties were investigated by a tensile test. Addition of HA particles improves the corrosion resistance of Mg97Zn1Y2 alloy without sacrificing tensile strength. The improved corrosion resistance is due to the formation of a compact Ca-P surface layer and a decrease of the volume fraction of the LPSO phase, both resulting from the addition of HA. After solution-treatment, the corrosion resistance of the composite decreases. This is due to the formation of a more extended LPSO phase, which weakens its role as a corrosion barrier in protecting the Mg matrix. View Full-Text
Keywords: biodegradable materials; magnesium alloys; hydroxyapatite; corrosion biodegradable materials; magnesium alloys; hydroxyapatite; corrosion
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Chiu, C.; Lu, C.-T.; Chen, S.-H.; Ou, K.-L. Effect of Hydroxyapatite on the Mechanical Properties and Corrosion Behavior of Mg-Zn-Y Alloy. Materials 2017, 10, 855.

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