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运用热力学数据,计算了高温镁熔体与3种含氟气体和空气的混合气体反应过程的自由能变化,根据自由能判据对这些反应发生的可能性和次序进行了分析,并用实验进行了验证。结果表明,镁熔体优先与含氟气体(或其分解产物)发生生成MgF2的反应,与O2反应生成MgO的趋势较小。由于与镁熔体反应时这3种含氟气体的化学状态各不相同,所以反应后排放气体的组成差异较大,在镁熔体表面所生成的氧化膜中MgF2和MgO的含量也有差别。
The thermodynamic data were used to calculate the free energy change of reaction process between high-temperature magnesium melt and three kinds of fluorine-containing gas and air. According to the free energy criterion, the possibility and order of these reactions were analyzed and experimentally carried out verification. The results show that the preferential reaction between magnesium melt and fluorine-containing gas (or its decomposition products) leads to the formation of MgF2, and the reaction of Mg with MgO2 tends to be less. Due to the different chemical states of the three fluorine-containing gases when reacting with the magnesium melt, the composition of the exhaust gas after the reaction is quite different. The content of MgF2 and MgO in the oxide film formed on the surface of the magnesium melt also varies.