对Ａｌ３１Ｌｉ及Ａｌ２７Ｌｉ０２１Ｙｍｍ二种合金的铸态及在５４０℃条件下固溶处理４小时后的组织进行了观察和分析，测定了二种合金在３５％ＮａＣｌ水溶液中的电化学腐蚀性能。结果表明：二种合金的宏观组织未见明显示差别，含Ｙｍｍ的合金微观组织较细化，添加少量Ｙｍｍ对合金的腐蚀性能有较好的影响，固熔处理后的合金耐腐性能提高 The microstructure of both Al31Li and Al27Li021Ymm alloys after as-cast and after solution treatment at 540 ℃ for 4 hours were observed and analyzed. The effects of the two alloys in 35% NaCl aqueous solution Electrochemical corrosion properties. The results show that the macrostructures of the two alloys show no obvious difference, the microstructure of the alloy containing Ymm is finer, the addition of a small amount of Ymm has a good effect on the corrosion resistance of the alloy, and the corrosion resistance of the alloy after the solid solution treatment is improved