镁合金消失模铸件表面膜成分及其结构  

Structure and Elemental Composition of Surface Film of Magnesium Alloy Lost Foam Casting

作　　者：董选普[1] 樊自田[1] 黄乃瑜[1] 

机构地区：[1]华中科技大学塑性成型模拟及模具技术国家重点实验室,湖北武汉430074

出　　处：《材料科学与工程学报》2005年第3期349-353,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目 ;(50 2 750 58)

摘　　要：采用X射线光电子能谱技术 (XPS)对消失模镁合金铸件的表面成分进行了测定 ,结果表明消失模镁合金铸件表面元素成分为Mg、Al、C、O、Si;结合对镁合金液和消失模样界面间的化学反应分析 ,揭示了消失模镁合金铸件表面是由MgO、Al2 O3、SiO2 和无定型C等组成的一层薄膜 ,即消失模镁合金铸件表面的Al2 O3-SiO2 -MgO -C复合膜 ;该复合膜对提高镁合金表面的防腐蚀性有很好的作用 ;提出了镁合金消失模表面膜的结构模型。这些结果表明 ,消失模技术作为镁合金零件的成形方法具有独特的优势。The Elemental composition on the Surface of Magnesium Alloy Lost Foam Casting (LFC) has been investigated by X-ray photoelectron spectroscopy (XPS). The results showed that there were Mg、Al、C、Si、O element on the surface of Magnesium Alloy Lost Foam Casting. Combining with chemical reaction analysis of Polymer-melt interface during casting formation in the lost foam process, the structure of surface film of magnesium alloy LFC was regarded as a composite thin film consisting of MgO 、Al_2O_3、SiO_2 and unformed C etc. The composite thin film performed an important function on corrosion resistance of magnesium alloy. The structure model of surface film of magnesium alloy LFC was put forward. Therefore, LFC was provided with unique advantage as a new forming technology of magnesium alloy part.

关 键 词：镁合金 消失模铸造 表面膜 

分 类 号：TG146.2[一般工业技术—材料科学与工程]