1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究

罗维; 钮东方; 杜荣斌; 王钧伟; 汪竹青; 徐衡; 张新胜

doi:10.13208/j.electrochem.161053

电化学 >

2017 , Vol. 23 >Issue 3: 332 - 339

DOI: https://doi.org/10.13208/j.electrochem.161053

有机电化学及电化学工业近期研究专辑（华东理工大学张新胜教授、北京化工大学曾程初教授主编）

1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究

罗维 ,
钮东方 ,
杜荣斌 ,
王钧伟 ,
汪竹青 ,
徐衡 ,
张新胜

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1.华东理工大学化学工程国家重点实验室，上海200237；2. 石油化工新材料协同创新中心，安徽安庆 246011

收稿日期: 2016-11-25

修回日期: 2017-02-07

网络出版日期: 2017-03-01

基金资助

安徽省石油化工新材料协同创新中心资助

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Electrochemical Deposition of Cr from Cr³⁺ in the Mixed Electrolyte of [BMIM]OAc/H₂O

LUO Wei ,
NIU Dong-fang ,
DU Rong-bin ,
WANG Jun-wei ,
WANG Zhu-qing ,
XU Heng ,
ZHANG Xin-sheng

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1.State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2. Collaborative Innovation Center for Petrochemical New Materials, Anqing 246011, Anhui, China

Received date: 2016-11-25

Revised date: 2017-02-07

Online published: 2017-03-01

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摘要

本文在[BMIM]OAc-H₂O电解液中研究了Cr³⁺的电沉积反应. 经循环伏安研究表明, Cr³⁺的还原属于受扩散控制的分步还原过程, 即Cr³⁺ + e → Cr²⁺和Cr²⁺ + 2e → Cr⁰. 在40℃下通过Rendle-Sevcik方程计算得到Cr³⁺的扩散系数为1.2×10^-8 cm²/s. 采用计时电流法探讨了Cr的三维瞬时成核机理. 对沉积的铬镀层进行了XRD、SEM表征, 结果表明经600℃氩气保护下煅烧后的镀层由Cr和Cr₂O₃纳米球状颗粒聚集而成, 其平均粒径为0.48μm. 对40℃，-3.0V条件下所得镀层进行EDX检测，发现Cr与O的能级峰十分明显，其中Cr的质量分数为83.8%. 通过在[BMIM]OAc、[BMIM]BF₄和[BMIM]PF₆三种离子液体体系中电镀得到的Cr镀层质量的比较, 表明OAc-的确有利于Cr的电沉积.

关键词： 电沉积; 1-丁基-3-甲基咪唑乙酸盐; 三价铬; 铬镀层

本文引用格式

罗维 , 钮东方 , 杜荣斌 , 王钧伟 , 汪竹青 , 徐衡 , 张新胜 . 1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究[J]. 电化学, 2017 , 23(3) : 332 -339 . DOI: 10.13208/j.electrochem.161053

Abstract

The electrochemical reduction of trivalent chromium ion (Cr³⁺) to Cr in 1-butyl-3-methylimidazolium acetate ([BMIM]OAc)-H₂O mixed electrolyte was investigated. The cyclic voltammograms showed that the electroreduction of Cr³⁺ in the mixed electrolyte occurred in a two-step process, namely, Cr³⁺+ e → Cr²⁺ and Cr²⁺+ 2e→ Cr⁰, controlled by the diffusion of Cr³⁺to the electrode. The diffusion coefficient of Cr³⁺ was 1.2×10^-8cm²/s at 40 ℃ obtained by Rendle-Sevcik equation. The chronoamperomograms of the Cr³⁺electrodeposition confirmed the three-dimensional instantaneous nucleation mechanism of Cr. The XRD and SEM characterizations on the Cr coating after calcining in argon atmosphere at 600℃ revealed that the coating was composed of Cr and chromium oxide (Cr₂O₃) nanoparticles with an average particle size of 0.48 μm. The elements of Cr and O were obviously detected from the coating obtained at 40℃ and -3.0V by EDX and the mass fraction of Cr reached 83.8%. Comparison in the qualities of coating layers prepared by Cr electrodepositions in [BMIM]OAc, [BMIM]BF₄and [BMIM]PF₆ electrolytes indicated that the OAc^- was presented in favor of Cr³⁺ reduction.

Key words： electrodeposition; 1-butyl-3-methylimidazolium acetate; trivalent chromium ion; Cr coating

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