室温下在二甲基亚砜中电沉积La-Co及La-Co-Ni合金粉末  

Electrodeposition of La-Co-Ni Alloy Powder in Dimethylsulfoxide at Room Temperature

作　　者：郭琳[1] 尹伟[1] 

机构地区：[1]广东教育学院,广东广州510303

出　　处：《稀有金属材料与工程》2006年第8期1341-1344,共4页Rare Metal Materials and Engineering

基　　金：广东教育学院中青年学术骨干教师培养项目

摘　　要：室温下在二甲基亚砜(DMSO)溶液中利用电解技术制备了具有金属光泽的分散La-Co及La-Co-Ni非晶态合金粉末。合金粉末颗粒尺寸在0.1μm～20μm范围内。La-Co合金粉末随着电解液中LaCl3和CoCl2浓度的变化,其La与Co的原子比由5:1变为1:5;La-Co-Ni合金粉末随着电解液中LaCl3浓度的增加,其La的含量由5.57%(质量分数)增加到15.28%。因此,可以通过控制电解液浓度比的方法来调节合金粉末中各金属的含量。对合金粉末压片样品进行线性扫描循环伏安试验研究,得出La-Co合金粉末中La3+,Co2+的还原峰电位分别为-2.68V,-1.83V;La,Co的氧化峰电位为-1.10V,-0.42V。La-Co-Ni合金粉末中Ni2+,Co2+共还原电位在-1.49V～-1.70V范围,Ni,Co的共氧化电位在-0.65V～-0.51V范围。The brown metallic luster La-Co and La-Co-Ni alloy powders were prepared by potentiostatic electrolysis technique in dimethylsulfoxide solution on Cu at room temperature. The atomic ratios of La and Co in La-Co alloy powders changed from 5：1 to 1：5 and the content of La in La-Co-Ni alloy powder was increased from 5.57% to 15.28% by the change of solution concentration. The size of metal grains is about 0.1μm to 20μm. The linear cycle V-A results showed that it can obtain different compositions of rare earth alloy powder by controlling the solution concentration. In the La-Co alloy powder, the reduced peak potentials of-2.68 V and -1.83 V are attributed to the reduction of La^3＋and Co^2＋; and -1.10 V and -0.42 V are attributed to the oxidation of La and Co; and -1.49 V-1.70 V and -0.65 V-0.51 V due to the co-reduction of Ni^2＋, Co^2＋ and co-oxidation of Ni and Co, respectively.

关 键 词：电沉积 La—Co合金粉末 La—Co-Ni合金粉末 二甲基亚砜(DMSO) 

分 类 号：TB383.3[一般工业技术—材料科学与工程]