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浇铸了４种不同ＲＥ含量的Ａｌ－Ｚｎ－Ｉｎ－Ｓｎ－Ｍｇ合金牺牲阳极．利用金相显微镜、扫描电镜（ＳＥＭ）和能谱分析，确定了４种合金的晶粒尺寸、偏析相数量及其成分．结果表明：随着ＲＥ含量的增加，铝合金的晶粒变小，偏析相的数量先增加后减少；偏析相主要为晶界析出物和弥散相；ＲＥ含量不同时，晶界析出物不同；细化阳极晶粒最佳ＲＥ含量０．５％，０．３％ＲＥ时阳极偏析相数量最多．
Four Al-Zn-In-Sn-Mg alloy sacrificial anodes with different RE contents were cast. The grain size, the amount of segregation phase and the composition of the four alloys were determined by metallographic microscope, scanning electron microscopy (SEM) and energy spectrum analysis. The results show that with the increase of RE content, the grain size of aluminum alloy becomes smaller and the number of segregation phases increases first and then decreases. The segregation phases are mainly grain boundary precipitates and disperse phases. When RE content is different, grain boundary precipitates are different. The optimum RE content of the grain refinement is 0.5%, and the amount of anode segregation phase is the most at 0.3% RE.