尿素熔盐中二元铁族合金膜的电沉积机理及磁性研究  

Electro-Deposited Binary Iron-Group Metal Alloy Films and Their Magnetic Properties in Urea Molten Salts

作　　者：赖恒[1] 李加新[2] 施小红[1] 吴珍珍[1] 蔡晓艺[1] 范必强[1] 黄志高[1] 

机构地区：[1]福建师范大学,福建福州350007 [2]中国科学院福建物质结构研究所,福建福州350002

出　　处：《稀有金属材料与工程》2010年第A01期101-106,共6页Rare Metal Materials and Engineering

基　　金：福建省资助省属高校项目(2008F5021);国家自然科学基金(60676055)资助项目

摘　　要：在Pt电极上,利用正交优化法于353K的乙酰胺-尿素-NaBr-KBr熔体中电沉积制备了性能各异的二元铁族金属合金膜,即Fe-Co、Fe-Ni及Co-Ni,分析获得最佳性能的磁性膜及其工艺参数;利用循环伏安法,研究了不同熔体组分的电化学行为,3种铁族金属离子在Pt电极上都是一步完全不可逆反应,并且Fe2+和Co2+、Fe2+和Ni2+及Co2+和Ni2+各自的共同沉积机理皆为异常共沉积;及通过电化学动力学行为的分析,发现二元合金膜的沉积效率及合金成分的变化受传质系数和扩散系数的影响。此外,对于Fe-Co和Fe-Ni,其矫顽力主要受沉积电位影响,而Co-Ni只受搅拌控制;对于剩磁比,Fe-Co和Fe-Ni主要受电位和摩尔比的共同影响,而Co-Ni只受电位影响,其中,搅拌对三者磁性膜的剩磁比几无影响;换言之,三者二元合金膜的磁性受其成分和具体结构的影响。Electro-deposited binary iron-group metal alloy films, i.e., Fe-Co, Fe-Ni and Co-Ni, obtained on copper substrates in urea-acetamide-NaBr-KBr melt at 353 K, were investigated by orthogonal experimental design. The cyclic voltammetry was used to study the electrochemical processes. Electroreduction of Fe^2＋, Co^2＋ and Ni^2＋ to metallic Fe, Co and Ni is irreversible in one step, respectively. Fe^2＋ and Co^2＋, Fe^2＋ and Ni^2＋, Co^2＋ and Ni^2＋ can be respectively co-deposited anomalously together. Upon analyzing the electrochemical behavior, it can be found that the electro-deposition efficiency and the contents of alloy films were strongly dependent on the transfer coefficient and the diffusion coefficient. Furthermore, the coercivity for Fe-Co and Fe-Ni was mainly influenced by deposition potential, while that of Co-Ni was stirring; for remanence ratio, samples Fe-Co and Fe-Ni were mainly controlled by both potentials and tool ratios, while that of Co-Ni was only potentials; in other words, the magnetic properties for these samples were also dependent on their contents and material structures. The results also showed that the optimized alloy films can be obtained by selecting the deposited conditions through the orthogonal design; the crystalline phases depend strongly on the deposition potentials.

关 键 词：二元铁族合金膜 异常共沉积 正交优化法 磁性能 

分 类 号：TQ153[化学工程—电化学工业]