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Improving the corrosion resistance of micro-arc oxidation coated Mg–Zn–Ca alloy

机译：改善微弧氧化涂层Mg-Zn-Ca合金的耐腐蚀性

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Four additives (Na _(2) WO _(4) , nano-hydroxyapatite, K _(2) TiF _(6) and NaF) were added into the Na _(5) P _(3) O _(10) + NaOH + C _(3) H _(8) O _(3) base electrolyte according to the orthogonal design of four factors three levels (L _(9) (3 ~(4) )). Nine different micro-arc oxidation (MAO) coatings were fabricated on Mg–2Zn–0.5Ca alloys through orthogonal experiments. The effects of four additives on the microstructure, mechanical properties, corrosion resistance and biocompatibility of MAO coatings were investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), electrochemical corrosion test and in vitro degradation test. The addition of nano-hydroxyapatite and K _(2) TiF _(6) showed self-sealing effects and contributed to the corrosion resistance of the samples significantly. The addition of 0.5 g L ~(?1) Na _(2) WO _(4) markedly elevated the bonding strength of the coatings with the substrate. The optimal combination of factors and levels considering both mechanical properties and corrosion resistance was: 0.5 g L ~(?1) Na _(2) WO _(4) , 0 g L ~(?1) NaF, 5 g L ~(?1) n-HAp, 5 g L ~(?1) K _(2) TiF _(6) . The growth mechanism of MAO coatings combining with the visual phenomenon was discussed as well.
机译：添加四种添加剂（Na _（2）WO _（4），将纳米羟基磷灰石，K _（2）TIF _（6）和NAF加入NA _（5）P _（3）O _（10）中加入+ NaOH + C _（3）H _（8）o _（3）底座电解质根据四个因子的正交设计三个级别（L _（9）（3〜（4））））。通过正交实验在Mg-2zn-0.5Ca合金上制造九种不同的微弧氧化（MAO）涂层。通过X射线衍射（XRD）研究了四种添加剂对MAO涂层的微观结构，机械性能，耐腐蚀性和生物相容性的影响，扫描电子显微镜（SEM），具有能量分散X射线光谱（EDS），电化学腐蚀试验和体外降解试验。添加纳米羟基磷灰石和K _（2）TIF _（6）显示了自密封效应，并有助于显着耐腐蚀性。添加0.5g L〜（α1）Na _（2）WO _（4）显着升高了涂层的粘合强度与基材。考虑机械性能和耐腐蚀性的因素和水平的最佳组合为：0.5g l〜（α1）Na _（2）WO _（4），0 g l〜（α1）naf，5 g l〜（ ？1）N-HAP，5g L〜（α1）k _（2）tif _（6）。讨论了与视觉现象组合的毛涂层的生长机制。

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