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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The effect of additives on the electrodeposition of aluminium from chloroaluminium ionic liquids
Qian Wang1; Xingmei Lu1; Suojiang Zhang1;1INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES, Beijing, China;
Type of Paper: Regular
Id Paper: 66
Topic: 37
Abstract:
Electrodeposition of aluminium (Al) from chloroaluminium ionic liquids (ILs) has been studied extensively. However, Al coatings obtained from these ILs lack metallic luster. In order to get coatings with a good surface, it is always necessary to add additives to the ILs electrolyte as that of aqueous solutions. There is little additives for ILs systems. We have chosen some pyridine derivatives (nicotinic acid, methyl nicotinate, nicotinamide and 3- methyl pyridine) to study the effect of them on the morphologies of Al coatings obtained from chloroaluminium ILs. It has been summarized from series of research results that pyridine derivatives with electron-withdrawing groups (nicotinic acid, methyl nicotinate and nicotinamide) have stronger adsorption ability on the cathode and they are effective brighteners. By contrast, the pyridine derivative with an electron-donating group(3-methylpyridine) has a weak adsorption ability and cannot be used as a brightener. Furthermore, the research results have proved that the brighteners refine the grain size, orient the Al(200) plane, and level the deposits; thus, Al coatings with highly uniform and smooth surface are obtained.
Acknowledgment: The authors gratefully acknowledge the financial support from the General Program Youth of National Natural Science Foundation of China (51404230), National Basic Research Program of China (2013CB632606), and National Natural Scientific Fund of China (21476234).