| HUANG Bo,WU Qing-dan,WEI Xin-long,XIAO Jin-kun,ZHANG Ga,ZHANG Chao.Tribocorrosion Behaviors of High Velocity Oxygen-fuel Sprayed WC-10Co-4Cr Coatings[J],49(1):285-293 |
| Tribocorrosion Behaviors of High Velocity Oxygen-fuel Sprayed WC-10Co-4Cr Coatings |
| Received:May 21, 2019 Revised:January 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.034 |
| KeyWord:WC-10Co-4Cr coating HVOF 304 stainless steel tribocorrosion wear |
| Author | Institution |
| HUANG Bo |
1.School of Mechanical Engineering, Yangzhou University, Yangzhou , China |
| WU Qing-dan |
1.School of Mechanical Engineering, Yangzhou University, Yangzhou , China |
| WEI Xin-long |
1.School of Mechanical Engineering, Yangzhou University, Yangzhou , China |
| XIAO Jin-kun |
1.School of Mechanical Engineering, Yangzhou University, Yangzhou , China |
| ZHANG Ga |
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| ZHANG Chao |
1.School of Mechanical Engineering, Yangzhou University, Yangzhou , China |
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| Abstract: |
| The work aims to study the tribocorrosion behaviors of the coatings sprayed under different spraying distances and improve coating properties by investigating its mechanism and optimizing the process parameters. WC-10Co-4Cr coatings were prepared on 304 stainless steel substrates by high velocity oxygen-fuel (HVOF) spraying technology. Microstructure and phase composition of the coatings were studied by scanning electron microscope (SEM) and X-ray diffractometer (XRD), and microhardness was measured by Vickers hardness tester. Tribocorrosion test was carried out on the coatings immersed in 3.5%NaCl aqueous solution by a reciprocation tribometer integrated with a potentiostat for electrochemical control to measure the wear rate, friction coefficient and polarization curve of the coating under static and sliding conditions. With the increase of the spray distance, the porosity of the coating decreased, but the hardness of the coatings increased, reaching 1100~1400 HV. The wear rate of the WC-10Co-4Cr coatings was lower than that of the 304 stainless steel by more than two orders of magnitudes when being subjected to sliding in the corrosive medium. The wear rate of the former was 1.7×10-7 mm3/(N•m), while that of the latter was 2.6×10-5 mm3/(N•m). The excellent tribocorrosion behaviors of WC-10Co-4Cr coatings are ascribable to synergistic actions of the load-bearing WC phase and the passive metal binder, which can resist the damage caused by tribocorrosion. |
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