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| Effect of Circulating Flow of Plating Bath on Ni-SiC Composite Coating in Closed and Bath Recyclable Electroplating Device |
| Received:May 25, 2021 Revised:June 11, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.08.015 |
| KeyWord:composite electroplating circulation bath flow rate Ni-SiC |
| Author | Institution |
| LI Lang |
School of Civil Aviation, Northwestern Polytechnical University, Xi’an , China |
| XIE Fa-qin |
School of Civil Aviation, Northwestern Polytechnical University, Xi’an , China |
| WU Xiang-qing |
School of Civil Aviation, Northwestern Polytechnical University, Xi’an , China |
| SONG Jia-lei |
School of Civil Aviation, Northwestern Polytechnical University, Xi’an , China |
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| Abstract: |
| This study is aimed to analyze the effects of different circular-flow velocities of plating solutions, which is based on the Ni-SiC composite coating in a self-designed and closed electrolyte-circulating plating apparatus and optimize circular-flow parameters. The Q235 tubular workpiece is seemed as the plated substrate and the plating solution has been solved by modified Watt bath containing SiC particles in this article. Ni-SiC composite coatings were prepared by circulating flow with three different rates (0.3 m3/h, 0.5 m3/h and 0.7 m3/h) on the internal wall of the tube in the mentioned electroplating device. Additionally, the macro-microscopic morphology, thickness, composition, structure, hardness and wear resistance of each Ni-SiC composite coating were measured and the results indicated that uniform and complete Ni-SiC composite coatings could be generated under the mentioned circulation flow. The color of the coating is affected by the SiC content, which reflects that the higher the SiC content, the weaker the metallic luster of the coating. With the circulating flow rate increases, the plating solution, the coating’s thickness and volume content of SiC particles were going to decrease. At first, the grain size of the coating decreases and then raised up, while the hardness showed oppositely. At the flow rate of 0.5 m3/h, the coating thickness, SiC particle content, grain size and hardness are 32.98 μm, 15.37%, 10.84 nm and 704HK0.245, respectively. Furthermore, the Ni-SiC composite coating prepared under this condition has the best wear resistance with a friction coefficient of 0.41 and a volume wear rate of only 2.83×10–5 mm3/Nm. The circulating flow rate of the plating solution has a significant effect on the Ni-SiC composite coating. When the circulating flow rate of the plating solution is 0.5 m3/h, the Ni-SiC composite coating obtained the best comprehensive performance. |
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