摘要
为进一步提升高质量WC涂层的耐磨性、耐海水腐蚀性和耐海水气蚀性。采用大气超音速火焰喷涂(HVAF)在0Cr13Ni5Mo基体上制备稀土La_(2)O_(3)改性WC-20Cr_(3)C_(2)-11NiMo涂层。通过显微硬度测试、平面孔隙测试、摩擦磨损实验、电化学实验和模拟海水超声波气蚀实验,测试涂层的显微硬度、孔隙率、摩擦因数、摩擦磨损性能、耐海水腐蚀性能和耐海水气蚀性能,分析La_(2)O_(3)对WC-20Cr_(3)C_(2)-11NiMo涂层耐磨耐蚀性能的影响。结果表明,改性后的涂层显微硬度提升到1400 HV0.2左右,平均孔隙率降低约48.6%;涂层磨损质量降低约33%,摩擦因数降低约30%,摩擦磨损表面微凹坑和微裂纹明显减少;电化学自腐蚀电位明显右移,电化学自腐蚀电流密度明显减小;涂层的气蚀质量损失减少约20%,气蚀坑洞明显减少和变小。HVAF喷涂La_(2)O_(3)改性后的WC-20Cr_(3)C_(2)-11NiMo涂层硬度略微提升,致密性、耐磨性、耐海水腐蚀性和耐海水气蚀性得到明显提升,除表面疲劳磨损外,表面摩擦磨损机理从严重磨粒磨损转变为轻微磨粒磨损,气蚀机理主要为流体冲击波侵蚀。
In order to improve the wear resistance,seawater corrosion resistance and seawater cavitation resistance of high-quality WC coating,WC-20Cr_(3)C_(2)-11NiMo coating modified by La_(2)O_(3)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 La_(2)O_(3)on the wear resistance and corrosion resistance of WC-20Cr_(3)C_(2)-11NiMo coating were studied.The results show that the micro-hardness of the modified coatings increases to about 1400 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-20Cr_(3)C_(2)-11NiMo coating,La_(2)O_(3)modified WC-20Cr_(3)C_(2)-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.
作者
张凯
刘伟
张磊
赵坚
伏利
陈小明
ZHANG Kai;LIU Wei;ZHANG Lei;ZHAO Jian;FU Li;CHEN Xiaoming(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;Ministry of Water Resources Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province,Hangzhou Mechanical Research Institute,Hangzhou 310012,China;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)
出处
《粉末冶金材料科学与工程》
EI
2021年第1期70-76,共7页
Materials Science and Engineering of Powder Metallurgy
基金
浙江省科技计划项目(2017C37048,2018C37029)
浙江省科技计划国际合作项目(2019C04019)
浙江省基础公益研究计划(LGC19E090001)。
关键词
HVAF
稀土改性
涂层
耐磨性
耐腐蚀性
耐气蚀性
HVAF
rare earth modification
coating
wear resistance
corrosion resistance
cavitation resistance
