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在620~710°C范围内,将压缩空气吹入含有陶瓷颗粒的A356铝合金熔体中制备泡沫铝样品。运用AES技术对泡壁表面进行分析,以研究温度对表面氧化膜厚度的影响。根据金属腐蚀学及流体力学原理建立表面氧化膜泡壁氧化动力学模型。从理论上预测不同温度条件下泡沫铝泡壁表面氧化膜的厚度,并与实验值进行对比。结果表明,在620~710°C范围内,考虑上浮过程的模型预测的氧化膜厚度理论值明显高于实验值,而不包含上浮过程的模型预测的理论值与实验值符合较好,且后者能更好地描述泡沫铝泡壁表面氧化膜的氧化过程。研究表明,吹气法泡沫铝泡壁表面氧化膜的氧化速率与温度之间的关系符合Arrhenius公式。
Foam samples were prepared by blowing compressed air into the A356 aluminum alloy melt containing ceramic particles at a temperature in the range of 620-710 ° C. The surface of bubble wall was analyzed by AES to study the effect of temperature on the thickness of oxide film on the surface. According to the theory of metal corrosion and hydrodynamics, the oxidation kinetics model of the surface oxide film bubble wall was established. The thickness of oxide film on the surface of foam aluminum foam wall under different temperature conditions is predicted theoretically and compared with the experimental data. The results show that the theoretical value of the oxide film thickness predicted by the model considering the floating process is significantly higher than the experimental value in the temperature range of 620 ° C to 710 ° C, while the theoretical value predicted by the model without the floating process is in good agreement with the experimental value. Can better describe the oxidation process of oxide film on the surface of aluminum foam foam. The results show that the relationship between the oxidation rate and the temperature of the oxide film on the surface of aluminum foam by the air blowing method accords with the Arrhenius formula.