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Volume 12
Issue 23
10.3390/ma12233884
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Article

Isothermal Diffusion Behavior and Surface Performance of Cu/Ni Coating on TC4 Alloy

by
Nan Wang
1,
Yong-Nan Chen
1,*,
Long Zhang
1,
Yao Li
1,
Shuang-Shuang Liu
1,
Hai-Fei Zhan
2,*,
Li-Xia Zhu
3,
Shi-Dong Zhu
4,* and
Yong-Qing Zhao
5
1
School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
2
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD 4001, Australia
3
CNPC Tubular Goods Research Institute, Xi’an 710017, China
4
School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, China
5
Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(23), 3884; https://doi.org/10.3390/ma12233884
Received: 30 October 2019 / Revised: 16 November 2019 / Accepted: 22 November 2019 / Published: 24 November 2019
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Abstract

The poor surface performance of titanium alloys substantially limits their application in many fields, such as the petrochemical industry. To overcome this weakness, the Cu and Ni double layers were deposited on the surface of TC4 alloy by the electroplating method, and the isothermal diffusion process was performed at 700 °C to enhance the binding ability between Cu and Ni layers. The isothermal diffusion behavior and microstructure of the coating were systematically analyzed, and tribological property and corrosion resistance of the coating were also evaluated to reveal the influence of isothermal diffusion on the surface performance. It was shown that multiple diffusion layers appeared on the Cu/Ni and Ni/Ti interface, and that NixTiy and CuxTiy phases were formed in the coating with the increase of diffusion time. More importantly, Kirkendall diffusion occurred when the diffusion time increased, which led to the formation of continuous microvoids and cracks in the diffusion layer, weakening the surface performance of the Cu/Ni coatings. This paper unveils the relationship between the microstructure of the Cu/Ni coatings and isothermal diffusion behavior, providing guidelines in preparing high performance surface coatings. View Full-Text
Keywords: titanium alloys; isothermal diffusion; intermetallic compounds; microvoids; surface performance titanium alloys; isothermal diffusion; intermetallic compounds; microvoids; surface performance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
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MDPI and ACS Style

Wang, N.; Chen, Y.-N.; Zhang, L.; Li, Y.; Liu, S.-S.; Zhan, H.-F.; Zhu, L.-X.; Zhu, S.-D.; Zhao, Y.-Q. Isothermal Diffusion Behavior and Surface Performance of Cu/Ni Coating on TC4 Alloy. Materials 2019, 12, 3884. https://doi.org/10.3390/ma12233884

AMA Style

Wang N, Chen Y-N, Zhang L, Li Y, Liu S-S, Zhan H-F, Zhu L-X, Zhu S-D, Zhao Y-Q. Isothermal Diffusion Behavior and Surface Performance of Cu/Ni Coating on TC4 Alloy. Materials. 2019; 12(23):3884. https://doi.org/10.3390/ma12233884

Chicago/Turabian Style

Wang, Nan, Yong-Nan Chen, Long Zhang, Yao Li, Shuang-Shuang Liu, Hai-Fei Zhan, Li-Xia Zhu, Shi-Dong Zhu, and Yong-Qing Zhao. 2019. "Isothermal Diffusion Behavior and Surface Performance of Cu/Ni Coating on TC4 Alloy" Materials 12, no. 23: 3884. https://doi.org/10.3390/ma12233884

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