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采用熔滴涂覆法,在AZ91表面制备了与基体冶金结合、且与涂覆原料性能相近的Al涂层。分析了涂覆界面附近区域的显微组织形貌、相结构及化学成分,并对显微硬度和耐蚀性进行了测试。结果表明,在熔滴涂覆过程中,Mg和Al元素发生了一定程度的扩散,但富Mg液相和富Al液相混溶的过程被限制在一个薄层区域内进行,所得Al涂层的化学成分、显微硬度及耐蚀性均与涂覆原料相近。这个结果说明,通过熔滴涂覆技术,可以制备成分可控的涂层,为利用现有耐蚀耐磨材料进行镁合金的表面防护提供了可能性。
The droplet coating method was used to fabricate an Al coating on the surface of AZ91. The Al coating was metallurgically bonded to the substrate and similar in properties to the coating. The microstructure, phase structure and chemical composition of the coating near the interface were analyzed. The microhardness and corrosion resistance were also tested. The results show that Mg and Al diffuse to some extent during the droplet coating process, but the process of miscibility of the Mg-rich liquid phase with the Al-rich liquid phase is limited to a thin layer region. The resulting Al coating The chemical composition, microhardness and corrosion resistance are similar to the coating material. This result shows that the composition controllable coating can be prepared by the droplet coating technology, which provides the possibility of surface protection of the magnesium alloy by using the existing corrosion-resistant and wear-resistant materials.