Betaine·HCl-6EG-nNiSO_4·6H_2O低共熔离子液体电沉积镍镀层  

Electrodeposition of Nickel Coating in Betaine·HCl-6EG-nNiSO_4·6H_2O Deep Eutectic Ionic Liquid

作　　者：龚凯[1,2,3] 华一新 徐存英[1,2,3] 李坚 李艳[1,2,3] 周忠仁 GONG Kai HUA Yixin XU Cunying LI Jian LI Yan ZHOU Zhongren(Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China Key laboratory of Ionic Liquid Metallurgy, Kunming University of Science and Technology, Kunming, 650093, China State Key laboratory of Clean Utilization of Complex Nonferrous Metal Resources in Yunnan Province, Kunming 650093, China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]离子液体冶金昆明理工大学重点实验室,云南昆明650093 [3]云南省复杂有色金属资源清洁利用国家重点实验室,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2017年第5期1-8,共8页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51274108;21263007);国家青年基金项目(51504112)

摘　　要：以盐酸甜菜碱(Betaine·HCl)、乙二醇(EG)和六水合硫酸镍(NiSO_4·6H_2O)制备的Betaine·HCl-6EG-nNiSO_4·6H_2O低共熔离子液体为电解液,在碳钢(CS)基体上电沉积出平整致密的金属镍镀层.采用旋转黏度计和电导率仪分别测定了其黏度和电导率.在测试条件下,其黏度为3.918~55.19 m Pa·s,电导率为1.109~0.199 S/m.循环伏安测试结果表明Betaine·HCl-6EG-nNiSO_4·6H_2O(n=0.071)低共熔离子液体中Ni^(2+)在CS电极上的电化学还原过程可以描述为Ni^(2+)→Ni^0,其起始还原电位为-0.56 V.对CS基体上的沉积层进行XRD和EDAS测试,分析结果表明镀层为具有面心立方晶型结构的金属镍.SEM结果表明得到的镍镀层晶粒细小致密且均匀.镀层截面组织金相照片和线性扫描能谱图表明沿CS基体各处均得到厚度分布均匀且与基体结合良好的镍镀层,其厚度约为11μm.The smooth and compact nickel coating is prepared on a carbon steel （CS） substrate from Betaine （HCl -6EG -nNiSO4 （6H2O deep eutectic ionic liquids（ DEILs）, which are formed with Betaine · HCl and EG containing NiSO4 · 6H2O. The viscosity and conductivity of Betaine ·HCl - 6EG - nNiSO4 · 6H2O DEILs are measured by using rotational viscometer and conductivity meter. Under the test conditions, the values of viscosity are 3.918 -55.19 mPa · s and the values of conductivity are 1. 109 -0. 199 S/re. The analysis of cyclic voltam- metry measurement shows that the electro - reduction of nickel on a CS working electrode can be described as Ni2＋ to Ni0, the initial reduction potential of which is - 0.56 V. The results of XRD and EDAS reveal that the cathodic coating obtained on the CS substrate is metallic nickel with a face - centered cubic crystal structure. Be-taine · HCl -6EG- nNiSO4· 6H2O can be used as electrolyte for nickel electrodeposition. SEM images exhibit the grains of the niekel are fine, dense and uniform. The metallographie image and linear scanning energy spec- trogram of the coated section indieate that the thickness distribution of nickel coating is distributed evenly along with the CS matrix. The nickel coating is in good combination with the CS substrate, and the thickness of which is about 11 μm.

关 键 词：低共熔离子液体 Betaine·HCl-6EG 电沉积 镍镀层 黏度 电导率 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TQ153.12[金属学及工艺—金属材料]