| XI Yun-tao,JIA Mao,ZHANG Jun,HUANG Xue-ping,QIAO Yu-long.Solid Particle Erosion Behavior of HVOF Thermal Spray WC-12Co and Ni60 Coatings at Different Angles of Attack[J],51(12):109-115 |
| Solid Particle Erosion Behavior of HVOF Thermal Spray WC-12Co and Ni60 Coatings at Different Angles of Attack |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.12.010 |
| KeyWord:WC-12Co coating Ni60 coating erosion angle of attack pipeline elbow |
| Author | Institution |
| XI Yun-tao |
Xi'an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi’an Shiyou University, Xi'an , China |
| JIA Mao |
Xi'an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi’an Shiyou University, Xi'an , China |
| ZHANG Jun |
Department of Science and Technology Management, Changqing Oilfield Company, CNPC, Xi'an , China |
| HUANG Xue-ping |
No.2 Gas Production Plant, Changqing Oilfield Company, CNPC, Xi'an , China |
| QIAO Yu-long |
No.1 Gas Production Plant, Changqing Oilfield Company, CNPC, Xi'an , China |
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| Abstract: |
| In order to solve the problem of penetration and leakage caused by erosion damage of elbow of gas transmission pipeline, it is found that there are many influencing factors of solid particle erosion, and the erosion attack angle is one of the most key factors. In view of the above problems, two kinds of coatings, such as WC-12Co and Ni60, were prepared on 20# steel substrate by DJ2700 high-velocity oxygen-fuel spraying (HVOF) equipment. The microstructure of the coating surface and section were observed by Nova Nano SEM450 scanning electron microscope (SEM). HXD-1000TMC/LCD microhardness tester was used to measure the hardness of coating section. XRD-6000 X-ray diffractometer (XRD) was used to analyze the coating composition of the surface coating of the samples. The self-made jet gas-solid erosion tester was used to carry out the solid particle erosion (SPE) test at three attack angles of 30°, 50° and 90°, and the micro morphology of the surface before and after the SPE test was observed by scanning electron microscope (SEM). The SPE mechanism and erosion rate of the substrate and the two coatings were studied through comprehensive analysis of the above test data. The results the microhardness of 20# steel substrate was the lowest, which was 139.5HV0.1. The microhardness of Ni60 coating and WC-12Co coating were significantly improved, which were 1 229.1HV0.1 and 613.1HV0.1, respectively. At the angle of attack of 30°, the SPE mechanism is mainly ploughing, and the erosion rate is greatly affected by the surface hardness. The erosion rate of 20# steel substrate is the largest, which is 0.040 5 mg/g, followed by Ni60 coating, which is 0.028 8 mg/g, and the erosion rate of the WC-12Co coating is the smallest, which was 0.010 8 mg/g. The WC coating has the highest hardness. At small angle of attack SPE, the coating basically does not have plastic deformation, and the coating is denser with few defects. The coating surface is flat and the furrow is shallow. At the angle of attack of 50°, the SPE mechanism is a mixed mechanism of ploughing and multi-impact fatigue. The erosion rate of 20# steel is significantly lower than that of 30°, but it is still the largest, which is 0.018 5 mg/g; The erosion rates of Ni60 coating and WC-12Co coating are basically similar, which are 0.011 5 mg/g and 0.011 7 mg/g respectively. At 90° angle of attack, the erosion rate of Ni60 coating is the highest, which is 0.017 1 mg/g, followed by 20# steel substrate, which is 0.009 5 mg/g, and the erosion rate of WC-12Co coating is the lowest, which is 0.001 4 mg/g. The erosion mechanism is mainly multi-impact fatigue damage. The WC-12Co coating has few defects, no cracks at the interface, and the erosion rate is the lowest, while Ni60 coating has cracks at the interface, many internal defects, poor fatigue resistance and the highest erosion rate. The WC-12Co coating shows excellent erosion resistance under three different attack angles, which provides a strong guarantee for improving the erosion resistance of gas pipeline elbow. |
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