Mg-Ni合金的电沉积研究  

Investigation of Electrodeposition of Mg-Ni Alloy

作　　者：郝泽铭[1,2] 宋师伟 陈冲 邓姝皓[2] 

机构地区：[1]三一重工泵送研究本院,湖南长沙410100 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2011年第5期107-110,113,共5页Mining and Metallurgical Engineering

摘　　要：采用电沉积的方法从非水体系和水体系中制备出镁-镍合金,并且制备了氢氧化镍。X射线衍射、扫描电镜和能谱分析结果表明,两种体系的沉积层均含有黑色非晶态的镁-镍合金,呈结瘤状的微观形貌。初步研究了沉积机理以及镁-镍合金的电化学性能,结果表明,镁镍合金在两种体系中沉积析出电位均为-2.0 V(vs SCE),沉积过程不可逆,非水体系的沉积较水体系困难。水体系脉冲条件下沉积的镁-镍合金氧化还原可逆性良好,其氢扩散系数很大,与氢氧化镍组成电池的工作电压较大,是一类良好的镍氢电池负极材料。Mg-Ni alloys were synthesized from nonaqueous and aqueous systems by the method of electrodeposition, and nickelous hydroxide was also prepared. The results of X-ray diffraction （XRD） , scanning electron microscopy （SEM） and energy spectrum analysis indicated that all the deposition layers in the two systems contained black amorphous Mg-Ni alloy with nodular microstructure. The investigation of the deposition mechanism and electrochemical properties of Mg-Ni alloy showed that the deposition potential of Mg-Ni alloy in the two systems was - 2.0 V （ vs SCE） and the deposition process was irreversible. The deposition in the nonaqueous system was more difficult than in the aqueous system. Mg-Ni alloy deposited under pulse in the aqueous system had good oxidation-reduction reversibility and a large hydrogen diffusion coefficient. The battery consisted of this kind of Mg-Ni alloy and nickelous hydroxide had a high working voltage. As a result, this kind of Mg-Ni alloy was a good cathode material for Ni-MH battery.

关 键 词：储氢合金 镍氢电池 负极材料 Mg—Ni合金 电化学共沉积 

分 类 号：TG174[金属学及工艺—金属表面处理]