间歇式电解制备高活性LaNi_(5-x)Al_x合金薄膜的研究  

Preparation of Highly Active LaNi_(5-x)Al_x Alloy Films by Pulse Electrolysis

作　　者：季凯[1] 韩庆[2] 徐玉松[1] 

机构地区：[1]江苏科技大学张家港校区,江苏张家港215600 [2]东北大学,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2015年第12期3089-3093,共5页Rare Metal Materials and Engineering

基　　金：江苏省科技厅自然科学青年基金(BK20130465);江苏教育厅高校基金面上项目(13KJB430011)

摘　　要：通过间歇式熔盐电解技术制备一种高活性LaNi_（5-x）Al_x合金薄膜材料,采用热力学计算、循环伏安技术研究Ni阴极的去极化能力以及在氧化物熔盐电解体系中La、Al的共析出条件,采用扫描电镜和X射线衍射仪对合金薄膜材料表层的显微组织结构进行观察与分析。结果表明：采用间歇式脉冲电解可以将电沉积和扩散过程有效分离,在设计Na_3AlF_6 114g、Al_2O_3 1.2 g以及La_2O_3 4.8 g的熔盐体系中Ni阴极上首先析出Al,形成液态Al-Ni阴极,使稀土La_2O_3活度大大降低,发生去极化作用,实现La、Al共析出,进而制备出高活性、成分均匀的LaNi_（5-x）Al_x合金薄膜,其中x的值介于3.5~4之间。Highly active LaNi5s-xAlx alloy films were prepared by pulse electrolysis. The depolarization of Ni cathode and the co-electrodepositing principle in the molten salt system was studied by thermodynamic calculation and cyclic voltammetry, while the microstructures of the alloy films were analyzed by scanning electron microscopy and X-ray diffractometry. The results show that the electrodeposition and diffusion processes are effectively separated by pulse electrolysis. In fact, the precipitation of aluminium in Ni cathode is found to significantly decrease the activity of La2O3 from Na3A1F6114g, Al2O3 1.2 g and La2034.8 g molten salts firstly, and then the depolarization of Ni cathode makes it possible for the co-electrodepositing principle of La and Al. Finally, the LaNi5-xA1x alloy films with high surface area and uniform composition are prepared, where x values are between 3.5-4

关 键 词：间歇式熔盐电解 循环伏安法 合金薄膜 电沉积 

分 类 号：TB383.2[一般工业技术—材料科学与工程]