水溶液中电沉积非晶态Ni-RE-P(RE=Ce,Nd)稀土合金

Preparation of Amorphous Rare-Earth Alloys of Ni-RE-P(RE=Ce, Nd) from Aqueous Solutions by Electrodeposition

报道了从水溶液中电沉积稀土含量高于30%的Ni-RE-P(RE=Ce,Nd)合金,其中Ni-P,Ni-Ce-P及Ni-Nd-P合金镀层均为非晶态结构,玻璃化温度约为385℃;用DTA测定了3种合金的晶化活化能分别为523.3kJ/mol,574.4kJ/mol,558.9kJ/mol;利用二维Miedema坐标(φ和3/1ws-n)以及加入尺寸因素(R/RA)构成的三维化学坐标分析了合金的非晶形成规律,探讨了实现稀土合金电沉积的途径,具体为选择适当的络合剂、合适的电极材料及合适的共沉积元素。

Rare-Earth Ni-RE-P(RE= Ce, Nd) alloy deposits with RE contents higher than 30wt% are obtained by electrodeposition from aqueous solutions. The method of preparation is discussed. The Ni-P, Ni-Ce-P, and Ni-Nd-P alloys are amorphous with glass transition temperatures of about 385degreesC. The crystallization activation energies of these amorphous alloys as determined using are, respectively 523.3, 574.4, and 558.9 kJ/mol. The regularity of formation of the amorphous alloys are studied by plotting a two dimensional figure with Miedema's coordinatesDelta phi(.) and Deltan(ws)(-1/3) and a three dimensional figure with chemical coordinates adding the size factor DeltaR/R-A.