研究了镁熔体在1,1,1,2-四氟乙烷(HFC-134a)与空气混合气体保护下的高温氧化特性。用热重法测定了氧化动力学曲线，用X-射线衍射仪和能谱仪分析了氧化膜中氧化产物组成和元素成分,讨论了氧化机理并提出了一个氧化模型。结果表明：镁熔体在HFC-134a与空气混合气体中的高温氧化行为与HFC-134a的浓度有关。在HFC-134a浓度较低的混合气体中，氧化膜主要由MgO组成，氧化过程表现出线性动力学的特征。在HFC-134a浓度较高的混合气体中，氧化膜主要由MgF2组成，氧化过程遵循抛物线规律。随着混合气体中HFC-134a浓度的增加，镁熔体的氧化速度减小。熔体温度对氧化行为也有一定的影响。
Molten magnesium has been oxidized in the atmospheres of air containing HFC-134a in the temperature range of 660℃~800℃. The oxidation kinetic curves of molten magnesium have been measured by the weight gain method. The oxidation products have been characterized by XRD and EDS. The results show that the oxidation kinetics of molten magnesium are greatly influenced by the concentration of HFC-134a and temperature. The curve of oxidation weight gain against time is linear and the oxidation film consists mainly of MgO when the concentration of HFC-134a in air is low. The oxidation follows parabolic rate law and the film consists mainly of MgF2 when the concentration of HFC-134a in air is high. An oxidation mechanism of molten magnesium in air containing HFC-134a has been proposed to account for the experimental results.
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