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通过固液复合法实现了电弧喷涂铝涂层与AZ91D镁合金基体之间的结合,并对结合界面的组织、元素和相组成进行了分析。结果表明:对涂层进行表面处理,结合界面容易出现气孔等缺陷。未经处理的涂层和基体之间形成冶金结合界面,并生成相应的金属间化合物。随着浇注温度的升高,扩散区域逐渐变宽,涂层逐渐转化为Al12Mg17和Al3Mg2。对复合材料进行热处理,结合界面组织更加均匀,扩散区域的厚度明显增加。镁合金作为目前最轻的金属结构材料,在汽车和航空航天等领域起到明显的减重效果,正得到日益广泛的应用。但镁合金耐蚀、耐磨等表面性能较差,也限制了它的大规模应用。在镁合金表面制备一层Mg-Al金属间化合物,可以在不增加镁合金质量的前提下,同时提高其耐蚀和耐磨性能[1,2]。目前,研究者往往通过表面技术和热处理在镁合金基体表面制备该化合物。例如,L.Zhu[3]等通过对AZ91D镁合金和铝
The combination of arc spraying aluminum coating and AZ91D magnesium alloy substrate was achieved by the solid-liquid complex method. The microstructure, element and phase composition of the bonding interface were analyzed. The results show that: the coating surface treatment, combined with interface prone to defects such as pores. The untreated coating forms a metallurgical bonding interface with the matrix and generates the corresponding intermetallic compound. As the pouring temperature increases, the diffusion area becomes wider and the coating gradually transforms into Al12Mg17 and Al3Mg2. The heat treatment of the composite material, combined with the interface structure more uniform, the thickness of the diffusion region increased significantly. As the lightest metal structural material, magnesium alloy plays a significant weight-loss effect in the fields of automobile and aerospace and is getting more and more widely used. However, magnesium alloy corrosion resistance, wear resistance and other poor surface properties, but also limits its large-scale application. The preparation of a layer of Mg-Al intermetallic compound on the surface of magnesium alloy can improve its corrosion resistance and wear resistance without increasing the quality of magnesium alloy [1,2]. At present, researchers often prepare the compound on the surface of magnesium alloy by surface technology and heat treatment. For example, L. Zhu [3] et al. Passed the AZ91D magnesium alloy and aluminum