摘要
采用浸泡试验、物相分析、显微组织观察等方法研究了ZM5镁合金和ZM5-0.1RE(RE为混合稀土)镁合金在质量分数为3.5%NaCl溶液中的腐蚀性能及机理。结果表明:加入0.1%RE后细化了ZM5镁合金的显微组织,其-βMg17Al12相的分布变为断续、弥散,降低了镁合金的腐蚀速率;稀土化合物相Al3Ce与Al11La3的生成降低了铝元素在-αMg晶粒内部的偏析程度是其耐腐蚀性能提高的原因。
Corrosion properties and mechanism of ZM5 magnesium alloy and ZM5-0. 1RE （RE was mischmetal） magnesium alloy in 3. 5wt% NaCl solution were investigated by immersion test, phase analysis and microstructure observation. The results indicate that after adding 0. lwt~ RE in ZM5 magnesium alloy, the micostructure was refined, 13-MglTA112 phases distributed discontinously and dispersively and the corrosion rate reduced. The generation of the rare earth compounds Ala Ce phase and Alll Laa phase reduced the segregation level of Al in α-Mg grains which was the main reason of the corrosion resistance increase.
出处
《机械工程材料》
CAS
CSCD
北大核心
2011年第4期76-78,90,共4页
Materials For Mechanical Engineering
关键词
ZM5镁合金
混合稀土
腐蚀
失重法
ZM5 magnesium alloy
mischmetal
corrosion
weight loss method
