| ZHOU Yong-kuan,KANG Jia-jie,FU Zhi-qiang,ZHU Li-na,SHE Ding-shun,LIANG Jian.Corrosion and Wear properties of HVOF Sprayed AlCoCrFeNi HEA Coating in Simulated Seawater Drilling Fluid[J],51(5):148-157 |
| Corrosion and Wear properties of HVOF Sprayed AlCoCrFeNi HEA Coating in Simulated Seawater Drilling Fluid |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.05.016 |
| KeyWord:HVOF AlCoCrFeNi HEA coating wear resistance corrosion resistance |
| Author | Institution |
| ZHOU Yong-kuan |
School of Engineering and Technology, China University of Geosciences Beijing, Beijing , China |
| KANG Jia-jie |
School of Engineering and Technology, China University of Geosciences Beijing, Beijing , China;Institute of Flexible Electronics Technology of Tsinghua, Zhejiang Jiaxing, , China;Zhengzhou Institute, China University of Geosciences Beijing, Zhengzhou , China |
| FU Zhi-qiang |
School of Engineering and Technology, China University of Geosciences Beijing, Beijing , China;Zhengzhou Institute, China University of Geosciences Beijing, Zhengzhou , China |
| ZHU Li-na |
School of Engineering and Technology, China University of Geosciences Beijing, Beijing , China;Zhengzhou Institute, China University of Geosciences Beijing, Zhengzhou , China |
| SHE Ding-shun |
School of Engineering and Technology, China University of Geosciences Beijing, Beijing , China;Zhengzhou Institute, China University of Geosciences Beijing, Zhengzhou , China |
| LIANG Jian |
Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Hebei Langfang , China |
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| Abstract: |
| With the depletion of land resources, the development of marine resources (such as oil, natural gas hydrate, solid minerals, etc.) has become one of the important strategic measures in China. The development of marine resources is inseparable from advanced marine drilling equipment. In order to ensure the reliability of offshore drilling, drilling equipment is put forward higher requirements for material properties, especially surface properties. However, only improving the performance of the substrate itself cannot meet the service requirements of the equipment in harsh conditions. Therefore, it is an effective method to use advanced surface engineering technology to strengthen the key vulnerable parts such as the drill pipe, casing and operation pump of offshore drilling equipment. The AlCoCrFeNi High-Entropy Alloy (HEA) is an excellent wear and corrosion resistant material. At present, there are many researches on the corrosion and wear properties of AlCoCrFeNi HEA, but there are few researches on the wear of AlCoCrFeNi HEA coating in drilling fluid, especially the tribological properties of AlCoCrFeNi HEA coating in seawater drilling fluid. In this paper, in order to improve the corrosion resistance and wear resistance of key wearing parts of drilling tools in practical application of offshore drilling, the AlCoCrFeNi HEA coating was prepared by High Velocity Oxygen Fuel (HVOF) technology, which was intended to be applied to the surface protection of offshore drilling equipment. The coating and 35CrMo steel substrate were subjected to electrochemical tests using electrochemical tests, including potentiodynamic polarization curve measurements and electrochemical impedance spectroscopy (EIS) measurements. The sliding wear behavior and failure mechanism of AlCoCrFeNi HEA coating sprayed by HVOF in simulated seawater drilling fluid were studied by friction and wear testing machine under different loads and sliding speeds. The wear surface and composition of the coating were analyzed by scanning electron microscope (SEM) and X-ray energy dispersive spectrometer (XRD). The wear three-dimensional morphologies and wear volumes of the coating were measured by three-dimensional white light interferometry. The results show that the corrosion resistance of AlCoCrFeNi HEA coating is better than 35CrMo steel substrate in the simulated seawater drilling fluid, indicating that AlCoCrFeNi HEA coating can play an effective role in the protection of offshore drilling tools. Under the same conditions, the wear resistance of AlCoCrFeNi HEA coating is better than that of 35CrMo steel substrate. The average COF and wear rate of AlCoCrFeNi HEA coating increase with the increase of load and sliding speed in the process of sliding friction and wear and both the average coefficient of friction and wear rate of the coating increase. With the increase of load and sliding speed, the abrasive wear degree of the coating increases, and the fatigue wear of the coating occurs when the load is 6 N. When the sliding speed is 0.15 m/s, the coating appears adhesive wear. In addition, the influence of simulated seawater drilling fluid on the wear performance of the coating can be divided into two aspects:on the one hand, it can play the role of lubrication. Simulated seawater drilling fluid significantly improves the friction and wear properties of the coating, and reduces the average friction coefficient and wear rate of the coating. On the other hand, the coating has been corroded to form corrosion pits, which will aggravate the wear of the coating. Above all, the HVOF sprayed AlCoCrFeNi HEA coating has excellent corrosion resistance in simulated seawater drilling fluid,which can effectively reduce wear, and is expected to be applied to the surface protection of key parts of offshore drilling tools. |
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