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稀土－钴合金因其具有磁性和磁光性等功能而为人们所关注．在有机溶剂电解液中，报道过的稀土－钴合金的电镀只有电镀Gd－Co和Sin－Co膜．在我们从尿素－金属氯化物熔体中获得La－Co电沉积物以前，未见在低温熔体中电沉积稀土－钴合金的研究报道．尿素（79mol％）－NaBr（19．5mol％）－KBr（1.5mol％）的熔点为51℃，可在100℃左右作为本底熔体，用于电解，本文研究在100℃的尿素－NaBr－KBr熔体中钴分别与钛、铽、镱的电解共沉积.测定循环伏安曲线获知Co2＋还原为Co是一步不可逆过程，加入NaOAc使Co的析出电位负移，因而可能有细化沉积物晶粒的作用．NaOAc的加入量较大时，还可使体系的熔点降低，Nd3＋、Tb3＋、Yb3＋还原为金属的电位很负，因此不能单独析出．但熔体中存在Co2＋时，却可诱导这几个稀土与钴共沉积，电解结果表明沉积物中Nd、Tb、Yb的含量随电位向负方移动而增加．在熔体中含有NaOAc，阴极电位为－1．0V时，电沉积的Nd－Co中含54．86wt％Nd，Tb－Co中含60．06wt％Tb，Yb－Co中含31．53wt％Yb．当熔体不含NaOAc时，稀土－钴沉积物的稀土含量增加．例如阴极电位为－1．0V在无NaOAc熔体中沉积的Yb－Co含Yb增加到55．04wt％．上述结果未见文献报道．
Rare earth - cobalt alloy because of its magnetic and magneto-optical functions for people’s attention. In organic solvent electrolytes, the reported rare earth-cobalt alloy plating only electroplating Gd-Co and Sin-Co film. Until we obtained La-Co electrodeposits from urea-metal chloride melts, no reports of electrodeposition of rare earth-cobalt alloys in cryogenic melts have been reported. The melting point of urea (79mol%) - NaBr (19.5mol%) - KBr (1.5mol%) is 51 ℃, which can be used as the background melt at about 100 ℃ for electrolysis. -KBr melt cobalt and titanium, terbium, ytterbium electrolysis co-deposition measured cyclic voltammetry Co2 + is reduced to Co is a one-step irreversible process, the addition of NaOAc negative shift of the precipitation potential of Co, which may refine the sediment The role of grain. When the amount of NaOAc is larger, the melting point of the system can also be reduced, and the potentials of Nd3 +, Tb3 + and Yb3 + reduced to the metal are very negative, and thus can not be separately precipitated. However, when Co2 + exists in the melt, co-deposition of these rare earths with cobalt can be induced. The results of electrolysis show that the content of Nd, Tb and Yb in sediments increases with the increase of potential. When the cathodic potential was -1.0 V in the melt, 54.86 wt% Nd was contained in the electrodeposition, 60.06 wt% Tb was contained in Tb-Co and 31.53 wt% Yb-Co was contained in the melt. Yb. When the melt does not contain NaOAc, the rare earth-cobalt deposit increases its RE content. For example, the Yb-Co containing Yb deposited in a NaOAc-free melt with a cathode potential of -1.0 V increases to 55.04% by weight. The above results have not been reported in the literature.