混合稀土阻燃ZM5镁合金的氧化膜结构分析  

Structure of Oxidation Film on Ignition-proof ZM5 Magnesium Alloys with MM (Mitschmetal) Addition

作　　者：李华基[1] 邓正华[1] 饶劲松[1] 黄锐[1] 陈婧 

机构地区：[1]重庆大学材料科学与工程学院 [2]重庆市万州第二高级中学

出　　处：《特种铸造及有色合金》2009年第1期5-7,共3页Special Casting & Nonferrous Alloys

基　　金：重庆市自然科学基金资助项目(8429)

摘　　要：通过添加0.1%的混合稀土(RE)到ZM5镁合金中,镁合金的起燃温度可提高约206℃,针对这种合金,利用SEM-EDS和X射线衍射分析表明,在高温下,该合金表面生成了一层由(RE)2O3(混合稀土氧化物)、MgO、Al2O3、Mg17Al12组成的致密氧化膜,混合稀土具有明显的表面富集现象;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,从而起到阻燃的效果。Ignition point of ZM5 magnesium alloy with 0.1%MM addition can be increased by approximately 206℃. Microstructure of the ZM5 magnesium alloy with 0.1% MM addition was observed by SEM (scanning electron microscope), EDS (energy dispersive spectrum and XRD (X-ray diffraction). The results indicate that compact oxidation film composed of RE2O3, MgO, Al_2O_3 and Mg17Al12 phase is created on the surface of the ZM5 magnesium alloy, on which MM exhibits obvious enrichment. Thermodynamic analysis of the forming process of oxide film reveals that interaction between RE and MgO can increase the RE2O3 content in middle layer, resulting in the improvement of compactness of middle layer, which is responsible for the improvement of ignition-proof effects of ZM5 magnesium alloy.

关 键 词：阻燃镁合金 混合稀土 氧化膜 热力学 

分 类 号：TG146.22[一般工业技术—材料科学与工程]