镁合金微弧氧化膜的相结构研究  

Phase Composition of Micro-Arc Oxidation Coating on Magnesium Alloys

作　　者：李颂[1] 刘耀辉[2] 张继成[1] 宋丽敏[1] 

机构地区：[1]空军航空大学航空理论系,长春130022 [2]吉林大学材料科学与工程学院,长春130025

出　　处：《航空材料学报》2008年第6期10-15,共6页Journal of Aeronautical Materials

基　　金：吉林省科技厅资助项目(20050506);长春市科技支撑计划(长科合2007KZ07)

摘　　要：针对镁合金微弧氧化膜层，对其相组成和晶粒尺寸随工艺参数的变化规律进行了定性和定量分析，并考察了相组成对膜层耐蚀性能的影响。结果表明：不同工艺参数条件下制备的微弧氧化膜层均由镁铝尖晶石和方镁石两相组成，但两相的含量差别很大。当这两相含量的比值在0．6～1．0范围内时，膜层的耐蚀性明显提高。不同时间内制备的膜层中MgAl2O4晶粒尺寸都在40～50nm的范围内，随着氧化时间的增加，晶粒尺寸呈现先减小后增大的趋势。Micro arc oxidation （MAO） processing is an emerging, environmentally friendly and simple magnesium alloys surface technique, which has a bright future in aviation, aerospace, walking machine and 3C etc. In this paper, the quantitative estimations for the mass percent of MgAl2O4 and MgO and the crystal size of MgAl2O4 are achieved by the XRD results, consequently, the corresponding response of phase composition to the corrosion resistance is proposed. The results show that the corrosion resistance of the MAO coating improves significantly when the mass percent ratio of MgAl2O4 to MgO is in the range of 0. 6 - 1.0. The crystal size of MgAl2O4 in the coatings obtained with different oxidation time is in the range of 40 - 50nm. In addition, the crystal size is decreasing and then increasing with increasing the process time.

关 键 词：镁合金 微弧氧化 相结构 晶粒尺寸 

分 类 号：TG174[金属学及工艺—金属表面处理]