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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。
Y and Ce at the same time join the magnesium alloy obtained excellent flame retardant effect, to achieve the magnesium alloy in the atmosphere under unprotected smelting. The results of AES and XRD show that when the Mg-Y-Ce flame-retardant magnesium alloy is exposed to the atmosphere at high temperature, a Y2O3-based oxide film is formed on the surface of the alloy. In dry air, the oxidation kinetics of Mg-3Y-4.5Ce alloy at 773, 873 and 973 K follow the cubic law. Based on the high-temperature oxidation thermodynamics, the selective oxidation mechanism of Mg-Y-Ce alloy at high temperature is analyzed in detail. The semiconducting characteristics of Y2O3 film and the inhibition mechanism of further oxidation of Mg-Y-Ce alloy are discussed from the electrochemical point of view.