摘要
采用循环伏安曲线、恒电位暂态电流-时间曲线和SEM等方法研究了工业电解液体系下温度对镍电化学行为及镍电沉积层微观组织的影响.结果表明:温度不改变该电解液体系中镍电沉积的形核/长大机理,其形核仍然为瞬时形核方式,生长符合三维瞬时形核生长模式.电解液温度升高,阴极峰峰值电流增大,镍的电结晶几率增加.温度升高镍电结晶初期的活性点并没有持续增加,提高温度会增加电解液的分散能力,电解液中Ni 2+更容易扩散至玻碳电极表面,镍晶粒形核及生长速率增大.当电解液温度为65℃时,镍电沉积层逐渐布满整个玻碳电极表面,沉积层晶粒尺寸均在100nm以下.
The effects of temperature on the electrochemical behaviour of nickel in an industrial electrolyte system and the microstructure of nickel electrodeposition layer were investigated by means of cyclic voltammetry curves,potentiostatic transient current vs time curves and SEM.The result showed that the temperature would not change the nucleation/growth mechanism of nickel electrodeposition in this electrolyte;The nucleation would still be instantaneous,and the growth would be in accordance with the three-dimensional instantaneous nucleation and growth mode.With the increase of temperature,the cathode peak current would increase,and the probability of electrocrystallization of nickel would increase.The activity site would not keep increasing at the initial stage of nickel electrodeposition.Increasing the temperature would increase dispersion ability of the electrolyte,the Ni 2＋would more easily spread to the surface of the glassy carbon electrode,and nickel grain nucleation and growth rate would increase.When the temperature of the electrolyte was 65℃,the nickel electrodeposition layer would gradually cover the surface of the glassy carbon electrode and the grain size in electrodeposition layer of nickel would be less than 100 nm.
作者
徐仰涛
吕游
刘鲁滨
XU Yang-tao 1,2 ,LU You 1,2 , LIU Lu-bin 1,2(1. College of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou Univ. of Tech., Lanzhou 730050, Chin)
出处
《兰州理工大学学报》
CAS
北大核心
2018年第3期21-25,共5页
Journal of Lanzhou University of Technology
关键词
温度
镍
电结晶
工业电解液
微观形貌
temperature
nickel
electrocrystallization
industrial electrolyte
micromorphology
