2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 3: Oye Intl. Symp. / Ionic Liquid and Aluminum
| Editors: | Kongoli F, Feng N, Polyakov P, Gaune-Escard M |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 180 pages |
| ISBN: | 978-1-987820-40-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Zinc electroplating in the zinc oxide-urea-1-ethyl-3-methylimidazolium chloride system at 333 K to 363 K
Wencai He1; Zhongning Shi2; Bingliang Gao1; Xianwei Hu2; Zhaowen Wang2;1, Shenyang, China; 2NORTHEASTERN UNIVERSITY, Shenyang, China;
Type of Paper: Regular
Id Paper: 129
Topic: 37
Abstract:
In the automobile industry, zinc is often used as anti-corrosive coatings on steel surfaces. Conventionally, 80% of the worldĄŻs zinc production is produced via the electrolysis of zinc oxide in a sulfuric acid electrolyte. However, this method inevitably involves hydrogen evolution on an electrode, which degrades current efficiency and causes massive hydrogen embrittlement in zinc coatings. This is a serious drawback for some substrate materials, especially for high-grade steels.
Hence, in this study, we developed a new electrolyte to replace sulfuric acid and investigated the effect of temperature on the electrochemical behavior of zinc coatings in the electroplating process.
The electrochemical behavior of zinc was recorded in a three-electrode cell by cyclic voltammetry and chronoamperometry techniques using a potentiostat/galvanostat. Electrodeposition experiments were conducted on a tungsten substrate and products were characterized by XRD, SEM and EDS.
Zinc coating was deposited electrochemically using ZnO as precursors instead of ZnCl2 and the effect of temperature on the electrochemical behavior of zinc coatings and surface morphologies of coatings in the zinc oxide-urea-1-ethyl-3-methylimidazolium chloride system were investigated. Cyclic voltammetry illustrated that the diffusion coefficients of zinc are rising as the temperature increases. Chronoamperometric experiments show that the zinc reduction process followed a three-dimensional instantaneous nucleation with a diffusion-controlled growth model. The Coatings electrodeposited on a tungsten substrate were pure zinc metal characterized by XRD and EDS. SEM analysis shows that the particles of zinc coatings became clusters when temperature increases from 333 K to 363 K