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镁合金熔炼时会发生剧烈的燃烧 ,因此必须采取有效的措施对其加以保护。合金化阻燃是一种理想的阻燃方法。从热力学角度对镁合金元素氧化方式的差异作出了解释 ,并采用统一的氧化模型分析了两种氧化膜的形成过程。研究结果表明 ,添加少量的Be或Ca可以提高Mg 9Al 0 .5Zn合金的燃点。但是 ,两种合金中基体元素Mg与合金元素Be和Ca的氧化方式并不相同。加入Be后 ,Mg发生外氧化 ,Be发生内氧化。加入Ca后 ,Ca发生外氧化 ,Mg发生内氧化 ,因此合金表面氧化膜的物相组成和元素分布也不相同
Magnesium alloy will occur when the smelting of intense combustion, it must take effective measures to be protected. Alloying flame retardant is an ideal flame retardant method. From the thermodynamic point of view, the differences of the oxidation modes of magnesium alloy were explained, and the formation of two kinds of oxide films was analyzed by the uniform oxidation model. The results show that adding a small amount of Be or Ca can improve the ignition point of Mg 9Al 0 .5Zn alloy. However, the oxidation of the matrix elements Mg and alloying elements Be and Ca in the two alloys is not the same. After addition of Be, Mg undergoes external oxidation and Be undergoes internal oxidation. After Ca is added, Ca is oxidized outside and Mg is oxidized internally, so the phase composition and elemental distribution of the oxide film on the surface of the alloy are also different