Mg-9Gd-2Y-Sm-0.5Zr合金组织和耐蚀性能研究  

Microstructure and Corrosion Resistance of Mg-9Gd-2Y-Sm-0.5Zr Alloy

作　　者：付三玲[1,2] 李全安[1,3] 井晓天[1] 陈君[3] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]河南科技大学物理与工程学院,河南洛阳471023 [3]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《稀土》2014年第4期52-56,共5页Chinese Rare Earths

基　　金：国家自然科学基金项目(51171059);河南省高校科技创新团队支持计划项目(2012IRTSTHN008);河南省基础与前沿技术研究计划项目(102300410018)

摘　　要：通过OM、SEM和XRD实验观察并研究了Mg-9Gd-2Y-Sm-0.5Zr(%质量分数)合金的微观组织和析出相,并采用腐蚀失重实验对合金的耐蚀性能进行了测试。结果表明,Mg-9Gd-2Y-Sm-0.5Zr合金微观组织主要由沿晶界分布的枝状共晶相和少量分布在晶内的小颗粒状相组成;析出相有α-Mg,Mg5Gd和Mg24Y5相。实验研究了该合金在不同浓度的NaCl溶液中的耐蚀性能,结果表明该合金腐蚀程度随着NaCl浓度的增加而增加,腐蚀产物以Mg(OH)2为主,腐蚀速率较低,耐蚀性能较好。The phase composition, the microstructure and the corrosion resistance of Mg-9Gd-2Y-Sm-O. 5Zr（ wt% ） alloy were studied by optical microscopy（ OM）, scanning electron microscopy （SEM） and X-ray diffract meter （XRD）, and the corrosion resistant properties of the alloy were tested by corrosion weightlessness experiment. The results showed that the mi- crostructure of Mg-9Gd-2Y-Sm-0.5Zr alloy is mainly composed of dendritic eutectic phase along the grain boundary distribution and a small amount granular phase composition in the intracrystalline, and the alloy＇ s precipitated phase included α-Mg phase, Mg5 Gd phase and Mg24 Y5 phase. The corrosion behavior of the alloy in different concentration of NaCl solution was researched by the brine immersion experiments, and the corrosion degree of the alloy was increased with the concentration of the NaCI solution concentration, and the corrosion products of the alloy was mainly Mg （OH）2, the alloy have low corrosion rate and prefect corrosion resistant performance.

关 键 词：Mg-9Gd-2Y-Sm-0.5Zr合金 组织 耐蚀性能 

分 类 号：TG166.4[金属学及工艺—热处理]