摘要
在ZM5镁合金中添加0.1%混合稀土RE(富Ce混合稀土)时,阻燃效果最佳,镁合金起燃温度提高到800℃以上。对该合金表面进行了DSC、SEM和XRD分析。结果表明:在高温熔炼时合金表面生成了一层由(RE)2O3、MgO和Al2O3组成的厚度为2-4μm的致密氧化膜。通过热力学研究氧化膜的形成过程发现,RE与MgO发生交互反应,使中间层的(RE)2O3增加,导致中间层致密度增加,致密的氧化膜抑制了基体镁合金的进一步氧化。
The ignition temperature of ZM5 magnesium alloy can be increased greatly by adding RE(Ce-rich mixed rare earth) to over 800℃.DSC,SEM and XRD results showed that a layer of tight oxide film composed of(RE)2O3,MgO and Al2O3 with the thickness of 2-4μm was formed on the surface of ZM5 magnesium alloy.Thermodynamic analysis of the forming process of oxidation film reveals that interaction between RE and MgO can increase the content of(RE)2O3 in middle layer,resulting in the improvement of compactness of middle layer.The tight surface oxide film prevented the further oxidation of magnesium alloy matrix.
出处
《铝加工》
CAS
2011年第2期4-7,共4页
Aluminium Fabrication
基金
东南大学创新基金资助项目(0941701)
关键词
ZM5镁合金
混合稀土
氧化膜
热力学
ZM5 magnesium alloy
rare earth
oxidation film
thermodynamics