J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (3): 233-244.DOI: 10.1016/j.jmst.2015.11.012

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Fabrication and Evaluation of a Bioactive Sr-Ca-P Contained Micro-Arc Oxidation Coating on Magnesium Strontium Alloy for Bone Repair Application

Junjie Han1, 2, Peng Wan2, Yu Sun3, Zongyuan Liu2, Xinmin Fan1, Lili Tan2, Ke Yang2   

  1. 1 Department of Materials Science and Engineering, Nanjing University of Science & Technology, Nanjing 210094, China;
    2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    3 China Medical University, Shenyang 110002, China
  • 收稿日期:2014-06-02 修回日期:2014-08-11 出版日期:2016-03-10

Fabrication and Evaluation of a Bioactive Sr-Ca-P Contained Micro-Arc Oxidation Coating on Magnesium Strontium Alloy for Bone Repair Application

Junjie Han1, 2, Peng Wan2, Yu Sun3, Zongyuan Liu2, Xinmin Fan1, Lili Tan2, Ke Yang2   

  1. 1 Department of Materials Science and Engineering, Nanjing University of Science & Technology, Nanjing 210094, China;
    2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    3 China Medical University, Shenyang 110002, China
  • Received:2014-06-02 Revised:2014-08-11 Online:2016-03-10
  • Contact: Ph.D.; Tel.: +86 24 23971676; Fax: +86 24 23978676.E-mail address: pwan@imr.ac.cn (P. Wan).
  • Supported by:
    This work was financially supported by the National High Technology Research and Development Program of China (No. 2015AA033701), the Chinese Academy of Sciences-Croucher Founding Scheme for Joint Laboratories (Ref. CAS 14303) and Foundation of Jiangsu Collaborative Innovation Center of Biomedical Functional Materials.

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摘要： Considering the compatibility between degradation and bioactivity of magnesium-based implants for bone repair, micro-arc oxidation is used to modify the magnesium alloy surface in aqueous electrolytes, allowing strontium, calcium, and phosphorus to be incorporated into the coating. The thickness, composition, morphology and phase of this Sr-Ca-P containing coating are characterized by scanning electron microscopy equipped with energy dispersive X-ray spectrometer and X-ray diffraction. The in vitro and in vivo degradation of the coating is evaluated by immersion test, electrochemical test and implantation test. Moreover, the cytocompatibility is tested with osteoblast cell according to ISO 10993. The results show that Sr, Ca and P elements are incorporated into the oxide coating, and a refined structure with tiny discharging micro-pores is observed on the surface of the coating. The Sr-Ca-P coating possesses a better corrosion resistance in vitro and retards the degradation in vivo. Such coating is expected to have significant medical applications on orthopedic implants and bone repair materials.

关键词: Magnesium alloy, Strontium, Ca-P coating, Degradation, Micro-arc oxidation

Abstract: Considering the compatibility between degradation and bioactivity of magnesium-based implants for bone repair, micro-arc oxidation is used to modify the magnesium alloy surface in aqueous electrolytes, allowing strontium, calcium, and phosphorus to be incorporated into the coating. The thickness, composition, morphology and phase of this Sr-Ca-P containing coating are characterized by scanning electron microscopy equipped with energy dispersive X-ray spectrometer and X-ray diffraction. The in vitro and in vivo degradation of the coating is evaluated by immersion test, electrochemical test and implantation test. Moreover, the cytocompatibility is tested with osteoblast cell according to ISO 10993. The results show that Sr, Ca and P elements are incorporated into the oxide coating, and a refined structure with tiny discharging micro-pores is observed on the surface of the coating. The Sr-Ca-P coating possesses a better corrosion resistance in vitro and retards the degradation in vivo. Such coating is expected to have significant medical applications on orthopedic implants and bone repair materials.

Key words: Magnesium alloy, Strontium, Ca-P coating, Degradation, Micro-arc oxidation