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Vol. 25 No. 2 (2013): Vol 25 Issue 2

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Influence of [Bmim]HSO4 on the Nucleation and Growth of Zinc on Aluminum from Acidic Sulphate Bath

https://doi.org/10.14233/ajchem.2013.12566
Q.B. Zhang
Key Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P.R. China
Y.X. Hua
Key Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P.R. China

Corresponding Author(s) : Q.B. Zhang

qibozhang@yahoo.com.cn

Asian Journal of Chemistry, Vol. 25 No. 2 (2013): Vol 25 Issue 2

Abstract

The effect of ionic liquid additive 1-butyl-3-methylimidazolium hydrogen sulphate-[Bmim]HSO4 on the nucleation and growth of zinc on aluminum from a 0.1 M ZnSO4 + 0.5 M Na2SO4 solution were investigated using cyclic voltammetry, chrono- amperometric current-time transients and scanning electron microscopy techniques. Dimensionless chronoamperometric current-time transients for zinc electrodeposition from the solution free of [Bmim]HSO4 were in good agreement with the theoretical transients for the limiting case of progressive nucleation with hemispherical diffusion-controlled growth of nuclei. The nucleation kinetics analysis suggested that active sites on the aluminum surface played the role of critical nuclei during the initial stages of the deposition process. The addition of [Bmim]HSO4 induced a blocking effect on the zinc electrodeposition process, leading to diminish the number of active sites for nucleus formation, decrease the nucleation and growth rate of the Zn2+ ions and modified the zinc crystal structure without affecting the progressive nucleation mechanism.

Keywords

Electrodeposition Zinc Ionic liquids Additive Nucleation and growth
Zhang, Q., & Hua, Y. (2012). Influence of [Bmim]HSO4 on the Nucleation and Growth of Zinc on Aluminum from Acidic Sulphate Bath. Asian Journal of Chemistry, 25(2), 701–707. https://doi.org/10.14233/ajchem.2013.12566
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