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首先采用表面机械研磨的方法实现了AZ91D镁合金表面纳米化,然后研究了熔盐扩渗Ce对AZ91D镁合金表层组织及耐蚀性能影响。采用扫描电镜(SEM)、透射电镜(TEM)以及X射线衍射(XRD)对扩渗层形貌、成分及物相进行了分析,并利用电化学工作站测试了渗层在3.5%Na Cl溶液中的耐蚀性能。研究结果表明,经过表面纳米化及熔盐扩渗Ce后,AZ91D镁合金表面耐蚀能力明显提高,扩渗层厚度随着扩渗时间的延长而增加,扩渗层变得更连续、致密,表面扩渗层的主要富稀土相为Al2Ce金属间化合物。
Firstly, the surface of AZ91D magnesium alloy was nanostructured by surface mechanical grinding. Then the effect of molten salt expanding Ce on the microstructure and corrosion resistance of AZ91D magnesium alloy was studied. The morphology, composition and phase of the diffusion layer were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The electrochemical performance of the diffusion layer in 3.5% NaCl solution Corrosion resistance. The results show that the surface corrosion resistance of AZ91D magnesium alloy increases obviously after surface nanocrystallization and molten salt expanding Ce. The thickness of the expanded layer increases with the extension of the expanding time, and the expanded layer becomes more continuous and dense. The main surface of the rare earth rich layer is Al2Ce intermetallic compound.