Degradation behavior of n-MAO/EPD bio-ceramic composite coatings on magnesium alloy in simulated body fluid
Degradation behavior of n-MAO/EPD bio-ceramic composite coatings on magnesium alloy in simulated body fluid
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镁合金上n-MAO/EPD生物陶瓷复合涂层在模拟体液中的降解行为
DOI：
10.1016/j.jallcom.2014.11.084
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发表时间：
2015-03
影响因子：
6.2
通讯作者：
Song, Renguo
中科院分区：
文献类型：
--
作者：
Xiong, Ying;Lu, Chao;Wang, Chao;Song, Renguo
为了提高ZK60镁合金在模拟体液中的耐生物腐蚀性能，在ZK60镁合金表面制备了生物陶瓷复合涂层。首先，在碱性电解液中，采用MAO技术在ZK60Mg合金表面制备了氧化锆（ZrO2）和氧化铈（CeO2）纳米颗粒的微弧氧化涂层（n-MAO涂层）。其次，采用电泳沉积（EPD）技术在n-MAO涂层表面沉积纳米羟基磷灰石（HA）。采用电化学阻抗谱（EIS）和浸渍法（36.5±0.5°C）研究了涂层样品在SBF中的降解行为。采用x射线衍射仪（XRD）和扫描电镜（SEM）分析了不同浸泡阶段涂层的相组成、表面形貌和截面形貌的变化。结果表明：在SBF浸渍过程中，涂层表面形成具有生物活性的沉淀层，能有效抑制镁合金的降解；与n-MAO涂层相比，具有HA致密结构的n-MAO/EPD复合涂层具有良好的防腐效果。提出了两种涂层在不同腐蚀阶段腐蚀过程的降解机理模型。n-MAO/EPD复合涂层的长期防腐性能主要受相组成稳定性和微观组织完整性的协同作用支配。
The bio-ceramic composite coatings have been fabricated on ZK60 magnesium (Mg) alloy to improve its bio-corrosion resistance in a simulated body fluid (SBF). Firstly, micro-arc oxidation coatings (n-MAO coating) with the addition of zirconium oxide (ZrO2) and cerium oxide (CeO2) nano-particles were prepared by MAO technique on ZK60Mg alloy in alkaline electrolyte. Secondly, nano-hydroxyapatite (HA) was deposited on the surface of n-MAO coatings by using electrophoretic deposition (EPD) technique. The degradation behavior of the coated samples was investigated by means of immersion tests and electrochemical impedance spectroscopy (EIS) in the SBF at 36.5 ± 0.5 °C. The variation of phase composition, surface and cross-section morphology of coatings at different immersion stages were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results showed that the precipitation layer with biological activity formed on the surface of coated samples during the SBF immersion, which can inhibit Mg alloys from degrading effectively. The n-MAO/EPD composite coating with HA dense structure has a favorable anti-corrosion effect compared to the n-MAO coating. Degradation mechanism model of the corrosion process at different corrosion stages for two kinds of coatings were proposed. The long-term corrosion protection of the n-MAO/EPD composite coating was governed significantly by the synergistic effect of phase composition stability and micro structural integrity.
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影响因子：
6.2
作者：
Gu, Yanhong;Bandopadhyay, Sukumar;Ning, Chengyun
通讯作者：
Ning, Chengyun
影响因子：
6.2
作者：
Ma Xun;Shijie Zhu;Liguo Wang;Chuanxiang Ji;C. Ren;S. Guan
通讯作者：
Ma Xun;Shijie Zhu;Liguo Wang;Chuanxiang Ji;C. Ren;S. Guan
影响因子：
5.8
作者：
Zhao, Quanming;Guo, Xiong;Wang, Kunzheng
通讯作者：
Wang, Kunzheng
影响因子：
8.3
作者：
Jun Liang;P. B. Srinivasan;C. Blawert;W. Dietzel
通讯作者：
Jun Liang;P. B. Srinivasan;C. Blawert;W. Dietzel
影响因子：
5.4
作者：
Nie, X;Leyland, A;Matthews, A
通讯作者：
Matthews, A