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对Mg-(4-x)Nd-x Gd-0.3Sr-0.2Zn-0.4Zr(x=0,1,3,质量分数,%,下同)镁合金进行了固溶处理。采用扫描电镜、能谱分析仪和X射线衍射仪研究了合金的显微组织与物相。利用失重和析氢法测试了合金在模拟体液中的腐蚀速率,并观察了合金的腐蚀形貌。结果表明,含1%Gd的合金晶粒最细小,且第二相较为连续地分布在基体周围,腐蚀速率也最低;而含3%Gd的合金晶粒最粗大,腐蚀速率最快。3种合金的腐蚀形貌较为均匀。
The Mg-4-xNd-xGd-0.3Sr-0.2Zn-0.4Zr (x = 0,1,3, mass fraction, the same below) magnesium alloy solution treatment. The microstructure and phase of the alloy were studied by SEM, EDS and XRD. The corrosion rate of alloy in simulated body fluid was tested by weight loss and hydrogen evolution method. The corrosion morphology of the alloy was observed. The results show that the alloy with 1% Gd has the smallest grain size and the second phase distributes continuously around the matrix with the lowest corrosion rate. The alloy with 3% Gd has the coarsest grain size and the fastest corrosion rate. The corrosion morphology of the three alloys is more uniform.