具有保护涂层的Mg-Ca合金在火焰环境下的抗氧化性能

Oxidation Resistance of Mg-Ca Alloys with Protective Coating Under Flame Exposure

摘要:

为了进一步扩大镁合金在高温环境下的应用，研究了Mg-0.3Ca和Mg-3.6Ca合金在火焰环境下的抗氧化性。结果表明，保护涂层显著提高了Mg-Ca合金在火焰环境下的抗氧化性，且Mg-3.6Ca合金的抗氧化性更佳。涂层降低了Mg-Ca合金的表面温度，最终提高了合金在火焰环境下的抗氧化性。然而，涂层对Mg-3.6Ca合金的隔热效果更好，这与表面膜上的钙聚集层有关。此外，具有钙聚集层的表面膜在保护合金方面起着至关重要的作用。Mg-0.3Ca合金表面没有明显的钙积累层，保护作用有限；而在Mg-3.6Ca合金上形成了含有Ca积聚层的表面膜，显示出优异的保护效果。

Abstract:

To further expand the application of Mg alloys at high temperatures, the oxidation resistance of Mg-0.3Ca and Mg-3.6Ca alloys with protective coating under flame exposure was studied. Results show that the oxidation resistance of Mg-Ca alloys under flame exposure is significantly improved by the protective coating, and Mg-3.6Ca alloy shows better oxidation resistance performance. The surface temperature of Mg-Ca alloys is reduced by the coating, therefore improving the oxidation resistance under flame exposure. However, the thermal insulation effect of the coating on Mg-3.6Ca alloy is better, which can be attributed to the Ca accumulation on the surface film. In addition, the surface film with Ca accumulation layer plays a crucial role in protecting the alloy. No obvious Ca accumulation layer exists on the Mg-0.3Ca alloy surface, presenting a restricted protective effect. Nevertheless, the surface film containing Ca accumulation layer is formed on Mg-3.6 Ca alloy, which shows an excellent protective effect.