Effect of Water on the Properties of Electrodeposited Zn-Fe Alloy Coating in Deep Eutectic Solvent

被引：0
|
作者：
Zhou G.-Q. [1 ]
Xiang Q. [1 ]
Qin S.-P. [2 ]
Wu M.-X. [1 ]
Naotoshi M. [2 ]
Wang W.-C. [1 ]
Chen Z.-D. [1 ]
机构：
[1] Changzhou University, Jiangsu, Changzhou
[2] Qualtec Materials Technology (Changzhou) Co., Ltd., Jiangsu, Changzhou
来源：
Surface Technology | 2023年 / 52卷 / 03期
基金：
中国国家自然科学基金;
关键词：
corrosion resistance; deep eutectic solvent; electrodeposition; water; Zn-Fe alloy coating;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.03.021
中图分类号：
学科分类号：
摘要：
Due to the wide electrochemical window and the excellent stability, deep eutectic solvent has been considered as an ideal solvent for electrodepositing Zn-Fe alloy coating. However, deep eutectic solvent has high viscosity and low conductivity at room temperature, resulting in low electrodeposition efficiency. Therefore, the work aims to solve the problems of high viscosity and low conductivity of deep eutectic solvent with water as an additive, so as to improve the surface morphology of the Zn-Fe alloy coating, optimize the crystal structure and improve the corrosion resistance of the coating. Conductivity meter, viscometer and cyclic voltammetry (CV) were used to study the effect of water content on the viscosity, conductivity, and electrochemical window of deep eutectic solvent. Scanning electron microscope (SEM) and energy spectrometer (EDS) were used to investigate the effect of water content on the surface morphology and composition of the Zn-Fe alloy coating. X-ray diffractometer (XRD) was used to analyze the effect of water content on the structural characteristics of the Zn-Fe alloy coating. Potential polarization curve and electrochemical impedance spectroscopy (EIS) were used to analyze the effect of water content on the corrosion resistance of the Zn-Fe alloy coating. When added to deep eutectic solvent, water replaced choline chloride and formed a new hydrogen bond system with ethylene glycol. The substituted choline chloride existed in the form of choline ion, which promoted the dissociation of deep eutectic solvent. Therefore, with the increase of water content, the viscosity of deep eutectic solvent decreased, the conductivity increased, the content of Zn element in the Zn-Fe alloy coating increased, the average grain size decreased, and the corrosion resistance of the coating firstly increased and then decreased. When the water content in deep eutectic solvent was less than 8wt.%, the water could promote the deposition of Zn and Fe. When the water content was greater than 8wt.%, the water could inhibit the deposition of Zn and Fe. In addition, when the water content was 4wt.%, the deep eutectic solvent could still maintain the original electrochemical window (2.47 V), the Zn-Fe alloy coating had a smooth and compact surface morphology, the polarization resistance of the coating reached the maximum value (1 469 Ω/cm2), the charge transfer resistance reached the maximum value (612 Ω/cm2) and the corrosion resistance was the best. Water content affects not only the viscosity, electrical conductivity and electrochemical window of DESs, but also the surface morphology, grain size and corrosion resistance of Zn-Fe alloy coating. When the content of water in deep eutectic solvent is 4wt.%, the water can not only promote the co-deposition of Zn and Fe, but also improve the surface morphology and crystal structure of the coating, thus strengthening the corrosion resistance. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
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