Electrodeposition Behavior of Zinc in Alkaline Zincate Electrolyte

doi:10.11902/1005.4537.2013.059

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (1): 89-94 DOI: 10.11902/1005.4537.2013.059

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Electrodeposition Behavior of Zinc in Alkaline Zincate Electrolyte

LI Yuanyuan¹, DU Nan¹(

), SHU Weifa², WANG Shuaixing¹, ZHAO Qing¹

1. National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University, Nanchang 330063, China
2. Nanjing Engineering Center of Aircraft Systems, Nanjing 211106, China

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Abstract

The cathodic reduction process of Zn in alkaline zincate electrolyte was studied by cyclic<br>voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS), while the electrochemical nucleation behavior of Zn was also characterized by using chronoamperometry (CA) and scanning electron microscope (SEM) techniques. The results indicated that Zn existed in the electrolyte in the form of Zn(OH)₄^2-, through a preceding reaction which then transformed into Zn(OH)₂ during electrodepositing. As the species directly discharged on the cathode surface, the discharge of Zn(OH)₂ is a two step-process, by the first step Zn(OH)_ad was produced and adsorbed on the surface of cathode, and then was reduced to Zn by the second step. The two steps of reduction of Zn(OH)₂ were all nonreversible reaction. It is beneficial to the electrodeposition of Zn when the applied potential reduces. The first discharge reaction of Zn(OH)₂ occurred when the applied potential was at -1.40~-1.50 V. The two discharge reactions of Zn(OH)₂ were both occurred in the alkaline zincate system when applied potential reduced to -1.60 V but in this case, Zn atoms only adsorbed on the cathode surface and the electrodeposition process was in a non-steady state. The adsorbed Zn could finally electrocrystallized to form a uniform Zn coating only when the applied potential reduces to -1.70~-1.80 V. The electrocrystallization of Zn from alkaline zincate electrolyte may follow a three-dimensional progressive nucleation mechanism.

Key words: alkaline zincate electrolyte zinc electrodeposition electrochemical impedance spectroscopy

Received: 22 April 2013

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Cite this article:

LI Yuanyuan, DU Nan, SHU Weifa, WANG Shuaixing, ZHAO Qing. Electrodeposition Behavior of Zinc in Alkaline Zincate Electrolyte. Journal of Chinese Society for Corrosion and protection, 2014, 34(1): 89-94.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.059 OR https://www.jcscp.org/EN/Y2014/V34/I1/89

Fig.1

平衡电势E_e与lnc(OH^-)的关系曲线

Fig.2

不同电流密度下的恒电流阶跃曲线

Fig.3

Iτ^1/2与I的关系曲线

Fig.4

不同NaOH含量下镀液的阴极稳态极化曲线

Fig.5

-1.60 V电位条件下lni与lnc(OH^-) 的关系曲线

Fig.6

不同扫描速率下Zn电沉积的循环伏安曲线

Fig.7

不同外加电位下碱性锌酸盐体系中锌电沉积过程的电化学阻抗Nyquist图及对应的Bode图

不同阶跃电位下Zn在碱性锌酸盐体系中电沉积的电流密度-时间暂态曲线及 (I/I_m)²与t/t_m曲线

Fig.9

-1.90 V电位下体系中不同阶跃时间时Zn在玻碳电极表面的SEM像

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