Wear resistance and corrosion resistance of La2O3 modified WC-20Cr3C2-11NiMo coatings sprayed by HVAF
ZHANG Kai1,2, LIU Wei1, ZHANG Lei1,2, ZHAO Jian1,2, FU Li1,2, CHEN Xiaoming1,2,3
1. Ministry of Water Resources Key Laboratory of Surface Engineering of Equipment for Hydraulic Engineering of Zhejiang Province, Standard & Quality Control Research Institute, Hangzhou 310012, China; 2. Ministry of Water Resources Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou Mechanical Research Institute, Hangzhou 310012, China; 3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Abstract：In order to improve the wear resistance, seawater corrosion resistance and seawater cavitation resistance of high-quality WC coating, WC-20Cr3C2-11NiMo coating modified by La2O3 were prepared on 0Cr13Ni5Mo substrate by HVAF. The micro-hardness, porosity, friction coefficient, friction and wear performance, seawater corrosion resistance and seawater cavitation resistance of the coatings were investigated by micro-hardness test, plane pore test, friction and wear test, electrochemical experiment and simulated seawater ultrasonic cavitation experiment. The effects of La2O3 on the wear resistance and corrosion resistance of WC-20Cr3C2-11NiMo coating were studied. The results show that the micro-hardness of the modified coatings increases to about 1 400 HV0.2, and the average porosity of the modified coatings decreases by about 48.6%. The wear amount of the modified coatings decreases by about 33%. The friction coefficient of the modified coating decreases by 30%, and the micro-pits and micro-cracks on friction and wear surfaces of the modified coating decrease significantly. The electrochemical self-corrosion potential shifts to the right, and the electrochemical self-corrosion current density decreases significantly. The loss of cavitation mass decreases by about 20%, and the cavitation pits decreases significantly. Compared with the unmodified WC-20Cr3C2-11NiMo coating, La2O3 modified WC-20Cr3C2-11NiMo coating can slightly improve the hardness of the coating, the compactness, wear resistance, seawater corrosion resistance and seawater cavitation resistance are significantly improved. Besides the surface fatigue wear, the mechanism of surface friction and wear changes from severe abrasive wear to slight abrasive wear. The cavitation mechanism is mainly fluid shock wave erosion.
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2021, Vol. 26 
