Synthesis and properties of a bio-composite coating formed on magnesium alloy by one-step method of micro-arc oxidation
Synthesis and properties of a bio-composite coating formed on magnesium alloy by one-step method of micro-arc oxidation
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DOI：
10.1016/j.jallcom.2013.12.145
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发表时间：
2014-03
影响因子：
6.2
通讯作者：
Ma Xun;Shijie Zhu;Liguo Wang;Chuanxiang Ji;C. Ren;S. Guan
中科院分区：
文献类型：
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作者：
Ma Xun;Shijie Zhu;Liguo Wang;Chuanxiang Ji;C. Ren;S. Guan
镁合金由于具有生物可降解性和优异的力学性能，已被用作生物可降解植入物。然而，骨种植体的快速腐蚀速度仍需要通过表面改性来改善，生物相容性也需要根据临床需求进行改善。本研究证明了在MAO过程中在电解液中加入HA颗粒在镁合金表面涂覆生物复合涂层（MAO - HA）的有效性。结果表明，在高压微弧放电的作用下，HA颗粒在高温下分解成Ca3(PO4)2，参与了MAO过程。同时，在高温下促进了Mg3(PO4)2的合成。烧结相Ca3(PO4)2和Mg3(PO4)2与HA结合构成生物活性涂层。通过划痕试验、电化学试验和短期浸渍试验证明，烧结产物封闭了MAO涂层的部分气孔，提高了复合涂层的结合强度和耐蚀性。因此，本研究表明，采用MAO-HA工艺制备的生物复合涂层可用于合成具有临床应用前景的骨种植材料。
Magnesium alloys have been used as biodegradable implants in load bearing applications due to their biodegradability and excellent mechanical properties. However, the rapid corrosion rate still needs to be improved by surface modification, and so does the biocompatibility according to clinical demands for bone implants. This study demonstrated the effectiveness of applying a bio-composite coating on magnesium alloy by adding HA particles in electrolyte during MAO process (MAO–HA). The results suggested that HA particles took part in MAO process, getting decomposed into Ca3(PO4)2under a high temperature caused by the intense micro-arc discharge generated at high applied voltage. In the meantime, synthesis of Mg3(PO4)2was promoted under the high temperature. The sintering-caused phases Ca3(PO4)2and Mg3(PO4)2combined with HA composed the bioactive coating. Testified by scratch test, electrochemical test and short-term immersion test, the composite coating showed high bonding strength and improved corrosion resistance owning to the sintering-caused products sealed partial pores of the MAO coating. Therefore, this study indicated that the bio-composite coating obtained by MAO–HA process may be suitable for synthesizing promising bone implant materials in clinical application.