铈对AZ91镁合金腐蚀性能的影响  

Influence of Cerium on Corrosion of AZ91 Magnesium Alloy

作　　者：刘生发[1] 刘林艳[1] 黄尚宇[1] 徐萍[1] 王仲范[2] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]武汉理工大学汽车工程学院,湖北武汉430070

出　　处：《中国稀土学报》2006年第2期211-216,共6页Journal of the Chinese Society of Rare Earths

基　　金：湖北省自然科学基金(2004ABA110);武汉理工大学博士基金(471-38300843)资助项目

摘　　要：利用静态失重法、极化曲线和金相观察研究了Ce对AZ91镁合金在3.5%NaCl（质量分数）水溶液中的腐蚀行为.结果表明,加入少量的Ce（0.2%～0.8%,质量分数）显著降低合金的腐蚀速率,提高合金的平衡电位和腐蚀电位,降低腐蚀电流密度.而且含0.8%Ce的合金具有较好的耐腐蚀性能.腐蚀性能提高的原因主要归结为： Ce加入导致α-Mg晶粒明显细化,Al元素的偏析减轻,块状的β-Mg17Al12相变为非连续网状分布.Effect of cerium addition on corrosion resistance of AZ91 magnesium alloy was investigated using the static weight loss and polarization curve method as well as metallographical observation. The results indicate that a small amount of cerium （0.2% ～ 0.8%） in AZ91 magnesium alloy can significantly reduce the corrosion rate, enhance the electrode voltage and lower corrosion current density in 3.5%NaCl aqueous solution, and AZ91-0.8%Ce alloy has better corrosion resistant performance. The reason for increasing corrosion resistance is attributed to the addition of Ce, refining the α-Mg grains, reducing the segregation of element Al, and improving the morphologies of β-Mg17 Al12 phases.

关 键 词：AZ91镁合金 铈 腐蚀性能 稀土 

分 类 号：TG146[一般工业技术—材料科学与工程]