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

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973 K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

Abstract:

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