Mg-Y-Ce稀土阻燃镁合金的高温氧化行为研究  

High Temperature Oxidation Behavior of Ignition-Proof Mg-Y-Ce Alloys

作　　者：关明[1] 郝维新[1] 樊建锋[2,3] 

机构地区：[1]太原科技大学,山西太原030024 [2]太原理工大学,山西太原030024 [3]新材料界面科学与工程教育部重点实验室,山西太原030024

出　　处：《稀有金属材料与工程》2010年第8期1375-1379,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50901048);山西省基础研究计划(2010021022-5);山西省高等学校优秀青年学术带头人支持计划

摘　　要：Y和Ce的同时加入使镁合金获得了优异的阻燃效果,实现了镁合金在大气条件下的无保护熔炼。AES和XRD表面分析结果表明,Mg-Y-Ce阻燃镁合金在高温下暴露于大气中时,合金表面会生成一层以Y2O3为主的氧化膜。干燥空气中,Mg-3Y-4.5Ce合金在773,873和973K下氧化时,其氧化动力学曲线遵循立方规律。基于高温氧化热力学,详细分析了Mg-Y-Ce合金在高温下的选择性氧化机制,并从电化学角度探讨了Y2O3膜的半导体特性及其对镁合金基体进一步氧化的阻碍机制。Joint addition of Y and Ce results in excellent ignition-proof effect and realizes no-protection melting in air for magnesium alloys.AES and XRD surface analyses show that an oxidation film mainly composed of Y2O3 was formed on the surface when the Mg-Y-Ce ignition-proof alloys were exposed in air at high temperature.When the Mg-Y-Ce alloys were oxidized at 773,873 and 973 K in dry air,the oxidation dynamics curves followed the cubic law.Base on the oxidation thermodynamics,the selective oxidation mechanism for Mg-Y-Ce alloys at high temperature was analyzed.The semiconductor characteristics of Y2O3 film and its proof effect on magnesium alloy oxidation were discussed electrochemically.

关 键 词：阻燃镁合金 氧化特性 表面分析 

分 类 号：TG146.22[一般工业技术—材料科学与工程]