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在AZ91D镁合金表面采用微弧氧化技术制备了不同厚度的陶瓷膜层,研究了不同厚度陶瓷膜层的高温氧化行为,讨论了膜层厚度对膜层高温氧化行为的影响。结果表明:膜层厚度在40μm内的AZ91D镁合金微弧氧化试样,在400℃加热128 h后,随膜层厚度的增加,膜层中疏松层所占比例增加,膜层对氧的阻挡作用增强,膜层增重量降低,膜层表面颜色变化减小,膜层破坏程度减轻,膜层在高温下保持完整的时间延长,高温氧化产物主要由镁和氧组成。
The ceramic films with different thicknesses were prepared by micro-arc oxidation on the surface of AZ91D magnesium alloy. The high-temperature oxidation behavior of ceramic films with different thicknesses was studied. The effects of film thickness on the high-temperature oxidation behavior of the films were discussed. The results show that when the coating thickness is within 40μm, the proportion of loose layer in the AZ91D magnesium alloy increases with the increase of the thickness of the coating and the oxygen barrier The role of enhanced film weight decreased, the film surface color change decreases, the film to reduce the extent of damage, the film remains intact at high temperatures extend the time, high temperature oxidation products mainly composed of magnesium and oxygen.