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以稀土合金为基体,探讨了在酸性的AlCl3-EMIC(2:1)室温熔盐中电沉积铝镀层的可能性,重点研究了稀土合金前处理工艺对镀层的影响。用SEM、EDS及XRD对电沉积前后的试样表面及界面进行了微观分析,用划格撕扯法对镀层与基体的结合力进行测定。结果表明,可以通过室温熔盐电沉积的方法,在稀土合金表面电沉积Al镀层;且对稀土合金表面在煤油中进行前处理,可防止稀土氧化膜的产生,并能得到均匀致密、结合良好的铝镀层;在电流密度2A/dm2,沉积时间2500s条件下,可得到颗粒大小约10μm、厚度17μm的纯铝层,电流效率接近100%。对稀土合金表面电沉积Al机制进行了讨论。
Taking rare earth alloy as matrix, the possibility of electrodepositing aluminum coating in acidic AlCl3-EMIC (2: 1) room temperature molten salt was discussed, and the effect of rare earth alloy pretreatment on coating was discussed. The surface and interface of the samples before and after electrodeposition were analyzed microscopically by SEM, EDS and XRD. The adhesion between the coating and the substrate was determined by the rip-tear method. The results show that the Al coating can be electrodeposited on the surface of rare earth alloy by room temperature molten salt electrodeposition. The pretreatment of rare earth alloy surface in kerosene can prevent the rare earth oxide film from being produced and obtain uniform and dense bonding Of the aluminum coating; the current density of 2A / dm2, the deposition time of 2500s conditions, the particle size of about 10μm, a thickness of 17μm pure aluminum layer, the current efficiency of nearly 100%. The mechanism of Al electrodeposition on rare earth alloy surface is discussed.