| [ChCl-3EG]／CrCl3·6H2O离子液体中电沉积铬镀层的研究 |
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| 引用本文： | 张志,李坚,华一新,王震,张远,柯平超.[ChCl-3EG]／CrCl3·6H2O离子液体中电沉积铬镀层的研究[J].昆明理工大学学报(理工版),2013(6):6-13. |
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| 作者姓名： | 张志 李坚 华一新 王震 张远 柯平超 |
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| 作者单位： | [1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]云南省复杂有色金属资源清洁利用国家重点实验室培育基地,云南昆明650093 |
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| 基金项目： | 国家自然科学基金项目（51274108）,云南省自然科学基金重点项目（2011FA009）,昆明理工大学2009年科研基金项目（KKZ42007270HD3）. |
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| 摘 要： | 以氯化胆碱（ChCl）、乙二醇（EG）和CrCl3·6H20制备的ChCl—3EG]／CrCl3·6H2O低共熔溶剂型离子液体为电解液，在镍基阴极上电沉积出黑铬镀层．采用冰点测定仪、旋转式黏度计、电导率仪分别测定了该离子液体的熔点、黏度和电导率，以线性扫描伏安法测得ChCl-3EG]离子液体的电化学窗口为3．22V．ChCl-3EG]／CrCl3·6H2O离子液体的循环伏安曲线表明Cr^3＋的电化学还原经历Cr^3＋→Cr^2＋和Cr^2＋→Cr^0两步还原反应，起始还原电位分别为-0．26V和-1．06V，且两步均为不完全可逆过程；以电流密度为20mA／cm。于50℃下进行恒电流电沉积30min，对阴极沉积物的XRD和XPS测试表明，镀层成分铬原子百分比为Cr80．94％、Cr20319．06％．sEM和AFM测试表明，在ChCl—3EG]／CrCl3·6H2O离子液体中可电沉积出平整、致密、无裂纹、表面粗糙度为5．56nm的黑铬镀层，电沉积铬的电流效率约为65．8％．
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| 关 键 词： | 三价铬 离子液体 电沉积 氯化胆碱-乙二醇 |
The Study of Electrodeposition of Chromium Coating in [ ChCl-3EG]/CrCl3· 6H2O Ionic Liquid |
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| ZHANG ZhiI,LI Jianl＇,HUA Yi-xin,＇,WANG Zhenl,ZHANG Yuanl,KE Ping-chao.The Study of Electrodeposition of Chromium Coating in [ ChCl-3EG]/CrCl3· 6H2O Ionic Liquid[J].Journal of Kunming University of Science and Technology(Natural Science Edition),2013(6):6-13. |
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| Authors: | ZHANG ZhiI LI Jianl＇ HUA Yi-xin ＇ WANG Zhenl ZHANG Yuanl KE Ping-chao |
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| Affiliation: | 1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,China; 2. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming 650093, China) |
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| Abstract: | Black chromium film is electrodeposited on the cathode of nickel substrates fi-om ionic liquids formed with Choline chloride and Ethylene Glycol containing CrC13· 6H2O. Cryoscope, rotational viscometer and con- ductivity meter are used to measure the inching points, viscosity and conductivity of the ionic liquids. The LSV test indicates the electrochemical windows of ChCl-3EG] ionic liquid is 3.22V. The cyclic vohammetry of ChC1-3EG]/CrC13 6H2O ionic liquid shows that the reduction of Cr3＋ to Cr includes two-step irreversible processes, the first being Cr3 ＋ to Cr： ＋ , then Cr2 ＋ to Cr＋ , the initial reduction potentials of which are -0.26V and -1.06V respectively. The Component analysis of black chromium films deposited at 20 mA/cm： current den- sity and 50℃ for 30 minutes shows that the chromium atomic percentage are Cr 80.94% and Cr203 19.06% re- spectively. The SEM and AFM analysis indicate that chromium can be electrodeposited efficiently to yield a com- pact, smooth and crack-free deposit in ChC1-3EGJ/CrCl3· 6H：O ionic liquid. |
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| Keywords: | trivalent chromium ionic liquid electrodeposition choline chloride-ethylene glycol |
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