Abstract
Silver is electroplated on the surface of connectors as a protective barrier layer in order to improve the corrosion resistance and to increase the durability of the connector. In this work, silver-graphene films were electrodeposited on copper–zinc alloy substrates from a succinimide silver-plating system in Hull-cell alkaline solutions by the addition of 0.4 g L–1 graphene oxide. The crystallographic structure and microstructure of the formed films were determined by X-ray diffraction and scanning electron microscopy, respectively. The corrosion resistance of the films was measured by a potentiodynamic polarization test. The results show that a low amount of graphene was incorporated into a silver deposit. The addition of graphene oxide could not influence the deposition rate and the crystallographic structure of the film, but resulted in a decrease in the size of aggregates or particles, compared with those of a pure silver film. The optimal current density was found to be 0.5 ~ 1.0 A dm–2, the surface of the films had a homogeneous close-packed fine-crystalline structure. The films were uniform, dense, and adherent to the substrate, without any evidence of delamination. At the same time, the addition of graphene oxide improved the corrosion resistance of silver films to a certain extent.
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ACKNOWLEDGMENTS
The authors thank Dr. Mengqi Cong from Jiangsu University of Technology for helping in the SEM/EDS characterization.
Funding
The authors express their gratitude to Zhenjiang Yinfeng Electroplating Technology Co., LTd and Zhenjiang Arf Special Coating Technology Co., Ltd for the support of this work. This work has also been partially supported by the Changzhou Sci and Tech Program (Grant no. CJ20190041) and the Funding of Changzhou High Technology Research Key Laboratory of Mould Advanced Manufacturing (Grant no. CM20173001) and the National Natural Science Foundation of China (Grant no. 51875053).
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Wangping Wu planned, wrote and supervised this work. Xiang Wang prepared the films by electrodeposition, co-wrote and edited this paper. Wangping Wu and Peng Jiang supervised master student Xiang Wang. Xiang Wang, Jianwen Liu and Dingkai Xie performed corrosion and optical micrograph tests. Junjun Huang, Peng Jiang, Ming Liu and Yi Zhang performed and analyzed characterization of graphene oxide. Lixin Tang and Yuefeng Chen conceived the rest of the experiments, and provided experimental platform and three months of internship experience for master students Xiang Wang and Dingkai Xie. All authors discussed the results and commented on the manuscript.
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Xiang Wang, Wu, W., Xie, D. et al. Electrodeposition of Silver–Graphene Films for Electronic Connectors in Succinimide Solutions. Surf. Engin. Appl.Electrochem. 57, 75–87 (2021). https://doi.org/10.3103/S1068375521010142
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DOI: https://doi.org/10.3103/S1068375521010142