微纳米WC-10Co4Cr涂层在NaCl介质中的抗泥沙冲蚀性能研究  

Research on Slurry Erosion Resistance of Micro-nano WC-10Co4Cr Coatings in NaCl Solution

作　　者：黄炎 丁彰雄[1] 喻仲昆 熊庭[1] 柯杜 Yan Huang;Zhangxiong Ding;Zhongkun Yu;Ting Xiong;Du Ke(School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063)

机构地区：[1]武汉理工大学能源与动力工程学院

出　　处：《热喷涂技术》2019年第4期16-24,共9页Thermal Spray Technology

基　　金：国家自然科学基金项目资助(51709210)

摘　　要：采用超音速火焰喷涂(HVOF)工艺制备了微纳米、纳米和普通结构WC-10Co4Cr金属陶瓷涂层,测量了涂层的显微硬度、孔隙率和开裂韧性,分析了三种WC-10Co4Cr涂层在3.5wt%NaCl溶液中的腐蚀电位和腐蚀电流密度,研究了喷涂层在NaCl介质中的抗泥沙冲蚀性能,并探讨了涂层在NaCl介质中的泥沙冲蚀机理。结果表明:微纳米WC-10Co4Cr涂层具有最优异的电化学性能;相比于纳米、微米涂层,微纳米涂层的抗泥沙冲蚀磨损性能分别提高了38%和78%。微纳米WC-10Co4Cr涂层致密的组织结构、高显微硬度(1126HV0.3)和高开裂韧性(4.66MPa·m1/2)有效减弱了泥沙冲蚀过程中的机械冲刷作用和电化学腐蚀作用。Micro-nano,nano and conventional structured WC-10Co4Cr cermet coatings were deposited by High Velocity Oxy-Fuel spray(HVOF).The microhardness,porosity and fracture toughness of the coatings were measured.The corrosion potential and corrosion current density of the three WC-10Co4Cr coatings in 3.5 wt%NaCl solution was analyzed.Furthermore,resistance of slurry erosion of the coatings in NaCl solution was studied and the slurry erosion wear mechanisms of the coatings were explored.The results show that the micronano WC-10Co4Cr coating possesses the most excellent corrosion resistance in NaCl solution.Compared with the nano and micro coatings,the resistance of slurry erosion of the micro-nano coatings is enhanced by 38%and 78%,respectively.The dense microstructure,high microhardness and high fracture toughness of the WC-10Co4Cr micro-nano coating effectively reduce the mechanical erosion and electrochemical corrosion effects during the slurry erosion process.

关 键 词：WC-10Co4Cr NACL溶液 微纳米涂层 泥沙冲蚀磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]