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首页> 外文期刊>Applied Surface Science >The formation of FHA coating on biodegradable Mg-Zn-Zr alloy using a two-step chemical treatment method
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The formation of FHA coating on biodegradable Mg-Zn-Zr alloy using a two-step chemical treatment method

机译：两步化学处理法在可生物降解的Mg-Zn-Zr合金上形成FHA涂层

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To improve the corrosion resistance of the biomedical magnesium alloy, a two-step chemical treatment method has been employed to prepare an FHA coating on the alloy surface. Prior to forming an FHA layer, the samples of Mg-3 wt% Zn-0.5 wt% Zr alloy were soaked in HF with concentration of 20% (v/v) at 37 degrees C temperature for 2 h, and were then placed into an aqueous solution with 0.1 mol/L Ca(NO3)center dot 4H(2)O and 0.06 mol/L NH4H2PO4 at 90 degrees C to prepare the Ca-P coating. The concentrations of Mg2+, F- ions, and pH variation with immersing time in the solution were investigated to explore the growth mechanism of FHA. The surface morphologies and compositions of the coatings were characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The results showed that the alloy surface treated with acid formed a layer of MgF2 nanoparticles with a thickness of 0.7 mu m. The corrosion resistance of coatings in SBF solution was evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The results showed that the substrate with FHA coating had good corrosion resistance. After immersing into the calcium phosphate solution, some small spherical particles were first formed on the surface; these then cover the surface completely after 20 min. Some clusters consisting of needle-like crystal were observed in the spherical particles covering the surface, and the Ca/P ratio of the needle-like crystal was 1.46, clearly growing along the c axis preferred orientation growth. After immersion for 60 min, the FHA coating with completely uniform growth was obtained on the Mg-Zn-Zr alloy surface with its thickness reaching about 120 mu m. (C) 2015 Elsevier B.V. All rights reserved.
机译：为了提高生物医学镁合金的耐腐蚀性，已采用两步化学处理方法在合金表面上制备FHA涂层。在形成FHA层之前，将Mg-3 wt％Zn-0.5 wt％Zr合金样品在浓度为20％（v / v）的HF中于37摄氏度的温度下浸泡2 h，然后放入在90摄氏度下使用0.1 mol / L Ca（NO3）中心点4H（2）O和0.06 mol / L NH4H2PO4的水溶液制备Ca-P涂层。研究了溶液中Mg2 +，F-离子的浓度和pH随浸泡时间的变化，以探索FHA的生长机理。通过X射线衍射，扫描电子显微镜和能量色散光谱对涂层的表面形态和组成进行表征。结果表明，经酸处理的合金表面形成了厚度为0.7μm的MgF2纳米颗粒层。通过电化学阻抗谱（EIS）和电势极化评估了SBF溶液中涂层的耐腐蚀性。结果表明，具有FHA涂层的基材具有良好的耐腐蚀性。浸入磷酸钙溶液后，首先在表面形成一些小的球形颗粒。然后在20分钟后将它们完全覆盖表面。在覆盖表面的球形颗粒中观察到一些由针状晶体组成的簇，针状晶体的Ca / P比为1.46，明显沿c轴生长，优选取向生长。浸泡60分钟后，在Mg-Zn-Zr合金表面上获得了完全均匀生长的FHA涂层，其厚度达到了约120μm。 （C）2015 Elsevier B.V.保留所有权利。

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