固溶处理态Mg-Nd-Gd-Sr-Zn-Zr生物镁合金的组织与均匀腐蚀行为

Microstructure and uniform corrosion behaviour of solution treated Mg-Nd-Gd-Sr-Zn-Zr bio-magnesium alloys

摘要:

对Mg-(4-x)Nd-xGd-0.3Sr-0.2Zn-0.4Zr(质量分数,%,x=0, 1和3)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,是理想的生物可降解材料。

Abstract:

Solution treatment was conducted on Mg-(4-x)Nd-xGd-0.3Sr-0.2Zn-0.4Zr(mass fractuon, %, x=0, 1, 3). The microstructures and phases were studied using scanning electron microscope (SEM), energy dispersive spectrometer and X-ray diffraction. The corrosion rates of the alloys in simulated body fluid were evaluated by mass loss and hydrogen evolution tests, and the corrosion morphologies of the alloys were observed by SEM. It is found that the grain size of the alloy with 1%Gd addition is the finest, as well as the lowest corrosion rate, and the second phase was located relatively continuously around the matrix. While the grain size of the alloy with 3%Gd addition is the coarsest and the corrosion rate is the highest. The alloys exhibit relatively uniform corrosion morphologies, and thus, they are desirable biodegradable materials.