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Materials 2017, 10(8), 855;

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

Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
Department of Dentistry, Cathay General Hospital, Taipei 106, Taiwan
Department of Dentistry, Taipei Medical University-Shuang Ho Hospital, New Taipei City 235, Taiwan
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)
Full-Text   |   PDF [8504 KB, uploaded 26 July 2017]   |  


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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