| YU Daqian,WANG Chengfeng,JI Renshan,SHI Liang,LIU Zengbin,LI Fuqiang,LI Haiqing,WANG Qimin.Preparation and Properties of Wear and Corrosion Resistant Coatings by a Hybrid HVOF/AIP Technique[J],54(1):42-52 |
| Preparation and Properties of Wear and Corrosion Resistant Coatings by a Hybrid HVOF/AIP Technique |
| Received:December 24, 2024 Revised:January 07, 2025 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.01.004 |
| KeyWord:high-velocity oxy-fuel spraying arc ion plating corrosion resistance wear resistance |
| Author | Institution |
| YU Daqian |
Beijing Tiandi Rongchuang Technology Co.Ltd., Beijing , China;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control, Beijing , China |
| WANG Chengfeng |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| JI Renshan |
Beijing Tiandi Rongchuang Technology Co.Ltd., Beijing , China;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control, Beijing , China |
| SHI Liang |
Beijing Tiandi Rongchuang Technology Co.Ltd., Beijing , China;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control, Beijing , China |
| LIU Zengbin |
Beijing Tiandi Rongchuang Technology Co.Ltd., Beijing , China;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control, Beijing , China |
| LI Fuqiang |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| LI Haiqing |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| WANG Qimin |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The issues of wear and corrosion deterioration have been persisting as problems in the feeding system of industrial pulverized-coal boilers during operation. In this study, WC-10Co4Cr, CrN, and hybrid WC-10Co4Cr/CrN coatings were prepared on 45# steel surfaces by high-velocity oxy-fuel (HVOF) spraying, arc ion plating (AIP), and a hybrid HVOF/AIP technique, respectively, to extend the service life of the 45# steel components within the pulverized-coal system. The phase structure and microstructure, surface and cross-sectional morphologies, and wear track morphologies were observed with X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The corrosion resistance of the coatings was characterized through electrochemical tests. The mechanical properties of the coatings were analyzed through nano-indentation test, Vickers indentation test, and high-load scratch test. The tribological properties of the coatings were analyzed by a pin-on-disk wear tester, both in atmospheric and pulverized-coal environments. The results indicated that the main phase in the HVOF WC-10Co4Cr coating was the WC phase. Some minor W2C, Co, and Co6W6C phases were also detected. In the AIP CrN and hybrid WC-10Co4Cr/CrN coatings, XRD peaks of FCC CrN phases prevailed. However, the preferred orientations on these two specimens were very different. The CrN coating deposited on 45# steel exhibited a strong (111) preferred orientation, whereas no obvious preferred orientation was observed in the CrN coating deposited on the WC-10Co4Cr coating. The WC-10Co4Cr coating had a thickness of approximately 230 μm with some internal pores, while the CrN coating was about 35 μm thick and relatively denser. The interface bonding between the WC-10Co4Cr, CrN, and WC-10Co4Cr/CrN coatings and the substrate was very adherent. Both EIS and potentiodynamic polarization curve tests indicated that corrosion resistance of the CrN and WC-10Co4Cr/CrN coatings were superior by an order of magnitude to that of the WC-10Co4Cr coating, suggesting that the CrN coating effectively covered the pores in the WC-10Co4Cr coating, significantly enhancing its corrosion resistance. Scratch test results showed that the adhesion of the WC-10Co4Cr/CrN composite coating was better than that of the single CrN coating. Nano-indentation test and Vickers hardness tests revealed that under lower loads, the hardness of both coatings was similar. However, as the load for Vickers hardness test increased from 10 N to 30 N, the hardness of the CrN coating decreased from 1 926.45HV to 703.88HV, while the hardness of the WC-10Co4Cr/CrN composite coating only decreased from 1 914.30HV to 1 591.48HV. The hardness of hybrid coatings under higher loads was significantly higher than that of single coatings. Strengthening of the thick WC-10Co4Cr interlayer coatings was important for the high-load application of the CrN coatings. The pin-on-disk friction-wear tests indicated that the wear rates of the CrN coating were 9.705×10‒7 mm3/(N.m) in the air atmosphere and 1.309×10‒6 mm3/(N.m) in the pulverized-coal environment, while the wear rates of the WC-10Co4Cr/CrN composite coating were 3.631×10‒7 mm3/(N.m) and 5.657×10‒7 mm3/(N.m) respectively in the above two environments, indicating that the wear resistance of the composite coating was much better than that of the single CrN coating. In summary, the WC-10Co4Cr coating prepared by HVOF exhibits good load-bearing capacity. The WC-10Co4Cr/CrN composite coating prepared by the hybrid technique can effectively enhance the wear and corrosion resistance of 45# steel simultaneously, thereby extending the service life of the 45# steel components. |
| Close |
|
|
|