期刊
ELECTROCHIMICA ACTA
卷 63, 期 -, 页码 131-138出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.12.070
关键词
Electrodeposition; Ionic liquid; Ni-Zn alloy; Nucleation; Corrosion resistance
资金
- National Basic Research Program of China [2007CB613701]
- Program of Shanghai Subject Chief Scientist [08XD14020]
- China Aerospace Science and Technology Corporation [0502]
The electrodeposition behavior of Ni-Zn alloys upon Cu was investigated in a choline chloride-urea (1:2 molar ratio) eutectic-based ionic liquid (1:2 ChCl-urea IL) bath containing 0.1 M NiCl2 and 0.4 M ZnCl2. Cyclic voltammetry reveals that the more noble metal, Ni, deposits preferentially to Zn. Ni-Zn co-deposition was achieved via deposition of Zn upon deposited Ni, at potentials more negative than that of Ni deposition, resulting in a Zn content always less than 50 at.%. Chronoamperometric investigations combined with SEM reveal the nucleation mechanism changes from three-dimensional progressive to instantaneous, followed diffusion-limited growth during Zn-codeposition. The Ni content of electrodeposits could be controlled by deposition potential and current density. Ni-Zn deposits were solid solutions, and deposits containing Ni > similar to 87 at.% display best corrosion resistance due to a dense and crack-free structure. (C) 2011 Elsevier Ltd. All rights reserved.
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