Effect of plating bath composition on the properties of zn-ni alloy coating in alkaline electrolysis system

被引：0
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作者：
Nanchang Hangkong University, Nanchang [1 ]
330063, China
不详 [2 ]
333001, China
不详 [3 ]
361005, China
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来源：
Surf. Technol. | 2020年 / 12卷 / 244-251期
关键词：
The work aims to find out the optimal process conditions and figure out the mechanism of Zn-Ni electrodeposition. The effects of the mole ratio of zinc ions to nickel ions and the total molar concentration of zinc ions and nickel ions on the glossiness; nickel content; corrosion resistance; appearance quality and microstructure of the coating were studied in an alkaline electrolyte system with an amino-carboxyl polyfunctional ligand as Ni2+ chelant by means of field emission electron microscopy; energy spectrum analysis and electrochemical analysis. The nickel content of the coating decreased with the increase of mole ratio of zinc/nickel ions; and was finally stabilized between 15%~19% and the microstructure of the coating changed from fine and smooth crystalline grain to coarse and loose one. When the mole ratio was 1.9; the corrosion current of the coating dropped to the lowest. The increase of the total molar concentration of zinc and nickel ions led to a slow decrease in nickel content of the coating and the microstructure of the coating changed from fine and loose crystalline grain to fine and compact one; but finally to the coarse and loose one. The corrosion current of the coating firstly decreased and then increased sharply with the total molar concentration; indicating that the corrosion resistance of the coating firstly increased and then decreased sharply. When the mole ratio of Zn2+/Ni2+ is 1.9 and the total concentration of Zn2+ and Ni2+ is 0.12 mol/L; the comprehensive properties of the coating are the best. The changing trend of Zn/Ni content in the coating is consistent with the adsorption film theory of Brenner. © 2020; Chongqing Wujiu Periodicals Press. All rights reserved;
D O I：
10.16490/j.cnki.issn.1001-3660.2020.12.028
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页码：244 / 251
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