| ZENG Qiu,LI Zhi-yong,MA Meng-ting,SONG Chao,SHENG Wang-di,ZHAN Dong-ping,TIAN Zhong-Qun,JIANG Li-min.Effect of Plating Bath Composition on the Properties of Zn-Ni Alloy Coating in Alkaline Electrolysis System[J],49(12):244-251 |
| Effect of Plating Bath Composition on the Properties of Zn-Ni Alloy Coating in Alkaline Electrolysis System |
| Received:February 25, 2020 Revised:April 30, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.12.028 |
| KeyWord:Zn-Ni alloy electrodeposition mole ratio of zinc ions to nickel ions total molar concentration corrosion resistance, alkaline bath |
| Author | Institution |
| ZENG Qiu |
Nanchang Hangkong University, Nanchang , China |
| LI Zhi-yong |
Jiangxi Changhe Aviation Industry Co., Ltd, Jingdezhen , China |
| MA Meng-ting |
Nanchang Hangkong University, Nanchang , China |
| SONG Chao |
Jiangxi Changhe Aviation Industry Co., Ltd, Jingdezhen , China |
| SHENG Wang-di |
Nanchang Hangkong University, Nanchang , China |
| ZHAN Dong-ping |
Xiamen University, Xiamen , China |
| TIAN Zhong-Qun |
Xiamen University, Xiamen , China |
| JIANG Li-min |
Nanchang Hangkong University, Nanchang , China |
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| Abstract: |
| 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. |
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