为提高镁合金的阻燃性能,在 ZM5 镁合金中添加了质量分数为0.1%的混合稀土(RE);通过分析该合金的TGA曲线、DSC曲线、恒温氧化动力学曲线以及表面氧化膜的XRD谱,对其表面氧化行为进行了研究.结果表明:添加0.1%RE能显著提高ZM5合金的抗氧化性能,氧化开始温度由300℃提高到500℃,氧化增重主要发生在500～700℃区间;在该温度区间发生了三种氧化反应,生成的氧化膜主要由RE2O3、MgO、Al2 O3、Mg17Al12等组成;该合金在700℃的氧化动力学曲线遵循抛物线规律,致密的氧化膜能有效阻止基体的进一步氧化.
0.1% (mass fraction) mixed rare earth (RE) was added into ZM5 magnesium alloy to improve its ignition-proof performance. TGA curve, DSC curve, oxidation kinetics curves at constant temperatures of the alloy and XRD spectrum of the surface film were analyzed in order to investigate the surface oxidation behavior. The results show that adding 0.1% RE to ZM5 alloy improved its anti-oxidation performance, the starting oxidation temperature obviously increased from 300 ℃ to 500 ℃. And the oxide increase occurred mostly between 500℃ and 700℃, that the formed oxidation film after three kinds of oxidation reactions mainly consisted of RE2O3, MgO,Al2O3 and Mg17Al12. The oxidation kinetics curve of the alloy followed the parabola rule at 700 ℃, which proved that the compact oxidation film could prevent the matrix from further oxidation effectively.
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