Preparation and properties of composite MAO/ECD coatings on magnesium alloy
Preparation and properties of composite MAO/ECD coatings on magnesium alloy
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DOI：
10.1016/j.colsurfb.2012.07.040
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发表时间：
2013-02-01
影响因子：
5.8
通讯作者：
Wang, Kunzheng
中科院分区：
文献类型：
--
作者：
Zhao, Quanming;Guo, Xiong;Wang, Kunzheng
镁合金具有优异的生物学性能和在生物环境中的生物可降解性，是一种潜在的生物可降解植入材料。然而，镁及其合金在人体体液或血浆中的快速腐蚀限制了其临床应用。本论文首先在含葡萄糖酸钙的电解液中进行微弧氧化，在镁合金表面制备了含钙磷的多孔微弧氧化膜。随后，采用电化学沉积（ECD）在微弧氧化涂层上制备羟基磷灰石（HA）涂层。终于来了在镁合金表面成功制备了微弧氧化/电化学沉积复合涂层。用X射线衍射和扫描电子显微镜与能量色散X射线光谱的生物涂层的相，形态和组成进行了监测，并通过电化学方法在模拟体液中的耐腐蚀性进行了评价。实验结果表明，在镁合金表面形成含羟基磷灰石的复合涂层，有效地降低了镁合金的腐蚀速率，更重要的是赋予了镁合金潜在的生物活性。我们相信，微弧氧化和电化学沉积的组合使用，以改善镁合金将使他们更有吸引力的临床应用。(c)2012爱思唯尔有限公司版权所有。
Magnesium alloys are potential biodegradable implants because of their outstanding biological performance and biodegradability in the bioenvironment. However, the rapid corrosion of magnesium and its alloys in human body fluids or blood plasma limits their clinical application. In the present work, we first fabricated porous micro-arc oxidation (MAO) coatings containing Ca/P on the magnesium alloy substrate by conducting MAO in the electrolyte containing calcium gluconate. Subsequently, hydroxyapatite (HA) coatings were prepared using electrochemical deposition (ECD) on the MAO coatings. Finally. a MAO/ECD composite coating was successfully fabricated on the magnesium alloy. The phase, morphology and composition of the biological coatings were monitored with X-ray diffraction and scanning electron microscopy with energy dispersive X-ray spectroscopy, and corrosion resistance was evaluated by means of electrochemical methods in a simulated body fluid. The experimental results indicated that the formation of HA-containing composite coatings on magnesium alloy effectively decreases its corrosion rate and more importantly endows it with a potential bioactivity. We believe that the combined use of MAO and ECD to modify magnesium alloys would make them more attractive for clinical applications. (c) 2012 Elsevier B.V. All rights reserved.