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Performance Analysis of Cavitation Erosion Resistance and Corrosion Behavior of HVOF-Sprayed WC-10Co-4Cr, WC-12Co, and Cr3C2-NiCr Coatings

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Abstract

Cavitation erosion is a major damage phenomenon in hydraulic turbine components that is caused by the bubble collapse. Protective coatings are widely applied as a form of surface modification to resist cavitation erosion. In this work, the WC and Cr3C2 cermet coatings were prepared by using HVOF, and their resistances to cavitation erosion in deionized water and 3.5 wt.% NaCl solution were evaluated. The corrosion behavior was investigated by potentiodynamic polarization in 3.5 wt.% NaCl solution, to examine the damaged surface morphologies and the corrosion products. Results indicated that higher hardness and fracture toughness, and lower porosity could enhance cavitation erosion resistance of the coatings in deionized water. In 3.5 wt.% NaCl solution, the cobalt matrix phase of the WC-12Co coating was dissolved in the corrosive solution, which accentuated the cavitation erosion damage. On the contrary, the oxidation product formed on the WC-10Co-4Cr and Cr3C2-NiCr coatings surface in 3.5 wt.% NaCl solution could mitigate delamination, seal surface pores, and protect from cavitation erosion damage. The WC-10Co-4Cr coating with higher hardness, higher toughness, and lower porosity, which exhibited the ability to form surface oxides in the corrosive solution, showed the best cavitation erosion resistance in both deionized water and 3.5 wt.% NaCl solution.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant Number 51422507). The authors express the gratitude to Professor J. Li, Professor Z.X. Ding and Professor H.T. Duan for their support to the experiments of this work.

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Authors and Affiliations

  1. Reliability Engineering Institute, National Engineering Research Center for Water Transport Safety, Wuhan University of Technology, Wuhan, 430063, People’s Republic of China

    Ji Liu, Chengqing Yuan & Xiuqin Bai

  2. State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, 430030, People’s Republic of China

    Tongzhou Chen

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  1. Ji Liu
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Liu, J., Chen, T., Yuan, C. et al. Performance Analysis of Cavitation Erosion Resistance and Corrosion Behavior of HVOF-Sprayed WC-10Co-4Cr, WC-12Co, and Cr3C2-NiCr Coatings. J Therm Spray Tech 29, 798–810 (2020). https://doi.org/10.1007/s11666-020-00994-y

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