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为了提高镁合金耐腐蚀性能,制备了血管支架用Mg-2Y-xZn-0.4Zr(x=0,1,2,4质量分数%)合金,采用光学显微镜、扫描电子显微镜、X射线衍射仪、失重等方法研究了四种合金在模拟人体体液(SBF溶液)中的腐蚀性能。结果表明,Zn元素的加入使得合金晶粒细化,1%的Zn元素加入后合金出现Mg_3YZn_6相,当Zn含量提高到2%时出现Mg_3Y_2Zn_3相,合金耐腐蚀性能先提高后降低。Mg-2Y-1Zn-0.4Zr合金展现出最佳的耐腐蚀性能。
In order to improve the corrosion resistance of magnesium alloy, Mg-2Y-xZn-0.4Zr (x = 0,1,2,4 mass%) alloy for vascular stent was prepared by using optical microscope, scanning electron microscope, X- Weight loss and other methods to study the four alloys in simulated human body fluids (SBF solution) corrosion performance. The results show that the addition of Zn element makes the grain refinement. The Mg_3YZn_6 phase appears after adding 1% Zn, and the Mg_3Y_2Zn_3 phase when the Zn content increases to 2%. The corrosion resistance of the alloy first increases and then decreases. Mg-2Y-1Zn-0.4Zr alloy to show the best corrosion resistance.