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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。
A kind of high activity LaNi_ (5-x) Al_x alloy thin film material was prepared by batch molten salt electrolysis technique. The depolarization ability of Ni cathode and the influence of La, Al co-precipitation conditions, the use of scanning electron microscopy and X-ray diffraction of the alloy film surface microstructure was observed and analyzed. The results show that the electrodeposition and diffusion process can be effectively separated by intermittent pulse electrolysis. Al is first precipitated on the Ni cathode in the designed molten salt system of Na_3AlF_6 114g, Al_2O_3 1.2 g and La_2O_3 4.8 g, and the liquid Al-Ni cathode is formed The activity of rare earth La 2 O 3 decreases greatly and depolarizes to realize the co-precipitation of La and Al, and then the LaNi_ (5-x) Al_x alloy film with high activity and composition is prepared, in which the value of x is between 3.5 and 4 .