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在Mg 9Al 0 .5Zn合金中添加 0 .3%铍 ,镁合金液抗氧化性能得到极大提高 ,可以直接暴露在大气中熔炼。X射线衍射表明 ,合金表面有结构远较氧化镁致密的氧化铍生成 ,从而导致整个氧化膜致密程度提高。利用俄歇电子能谱 (AES)进行氧化膜元素深度剖析发现 ,在含 0 .3%铍的镁合金液表面生成的氧化膜可以分为 3个亚层 :最外层为氧化镁层 ;中间层为致密复合层 ,由氧化铍、氧化镁和氧化铝组成 ;内层为氧化膜向基体的过渡层。热力学分析表明 ,氧化膜中的这种分层结构同镁的高蒸汽压以及自由能变化吻合。
In Mg 9Al 0 .5Zn alloy added 0.3% beryllium, magnesium alloy oxidation resistance has been greatly improved, you can directly exposed to the atmosphere melting. X-ray diffraction shows that the surface of the alloy is formed with beryllium oxide which has a structure far more dense than that of magnesia, resulting in an increase in the density of the entire oxide film. The depth analysis of the oxide film using Auger electron spectroscopy (AES) revealed that the oxide film formed on the surface of the magnesium alloy liquid containing 0.3% beryllium can be divided into three sublayers: the outermost layer is a magnesium oxide layer; the middle The layer is a dense composite layer composed of beryllium oxide, magnesium oxide and aluminum oxide; the inner layer is a transition layer of the oxide film to the substrate. Thermodynamic analysis shows that the layered structure in the oxide film is consistent with the high vapor pressure of magnesium and the change of free energy.