稀土合金表面室温熔盐电沉积铝的研究

Electrodeposition of Aluminum on Rare Earth Alloy Surface in Room Temperature Molten Salts

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。

Feasibility of electrodepositing aluminum coatings on the rare earth alloy in the acidic AlCl3-EMIC（2：1） room temperature molten salts was discussed,and the effects of pretreatment process of the rare earth alloy on aluminum coatings was studied.The microscopic analysis for the surface and interface of the samples was performed by SEM,EDS and XRD and the adhesion was determined by score-tearing test.The results show that the aluminum coatings can be electrodeposited on rare earth alloys in the room temperature molten salts.The pretreatment in kerosene for the rare earth alloy surface can prevent the emergence of rare earth oxide film;thus,uniform and dense aluminum coatings with good adhesion can be achieved.Under the condition of current density 2 A/dm2 and deposition time 2500 s,aluminum coatings with the particle size of 10 μm and the thickness of 17 μm can be obtained and the current efficiency is close to 100%.The mechanism of electrodeposition of aluminum on rare earth alloy surface was also discussed.