低钆镁合金的组织和耐蚀性  

Microstructure and Corrosion Resistance of Low Gd Magnesium Alloys

作　　者：唐利平[1] 赵仕林[2] 

机构地区：[1]四川化工职业技术学院,泸州646000 [2]四川师范大学,成都610100

出　　处：《腐蚀与防护》2015年第2期177-181,共5页Corrosion & Protection

基　　金：四川省基础前沿技术计划(142A0352)

摘　　要：采用OM、SEM和XRD观察并研究了Mg-6Gd-2Y-1Sb-0.5Zr和Mg-9Gd-2Y-1Sb-0.5Zr(质量分数/%)合金的微观组织和析出相,并采用腐蚀失重试验对合金的耐蚀性能进行了测试。结果表明,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。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 and microstructure of Mg-6Gd-2Y-1Sb-0.5Zr and Mg-9Gd-2Y-1Sb-0.5Zr（%）alloys were studied by optical microscopy（OM）,scanning electron microscopy（SEM）and X-ray diffraction（XRD）,and the corrosion resistant properties of the alloys were tested by corrosion weightlessness experiment.The results showed that the microstructure of the alloys was mainly composed of dendritic eutectic phase along the grain boundary distribution and a small amount of granular phase composition in the grains,and the alloy′s precipitated phase includedα-Mg phase,Mg5 Gd phase and Mg24Y5 phase.The corrosion degree of the alloys was increased with increasing the concentration of the NaCl,and the corrosion product was mainly Mg（OH）2,the alloys had low corrosion rates and prefect corrosion resistant performance.

关 键 词：Mg-Gd-Y-Sb-Zr合金 显微组织 耐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]