超音速火焰喷涂WC-Co-Ni涂层电化学腐蚀行为研究  

Electrochemical corrosion behavior of HVOF sprayed WC-Co-Ni coatings

作　　者：范俊 杨超[1] 刘志强 陈清宇[1] 富伟[1] 王洪涛[1,2] FAN Jun;YANG Chao;LIU Zhi-qiang;CHEN Qing-yu;FU Wei;WANG Hong-tao(School of Mechanical and Materials Engineering,Jiujiang University,Jiujiang 332005,China;Jiangxi Province Engineering Research Center of Materials Surface Enhancing&Remanufacturing,Jiujiang University,Jiujiang 332005,China)

机构地区：[1]九江学院,机械与材料工程学院,江西九江332005 [2]九江学院,江西省材料表面再制造工程技术研究中心,江西九江332005

出　　处：《化学研究与应用》2020年第9期1547-1551,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(51861012,51561013)资助;江西省教育厅科技项目(GJJ170946)资助;江西省自然科学基金项目(20171BAB206007);九江市科技局科技支撑项目([2012]84)资助;装备预研基金项目(6142005180204)资助。

摘　　要：采用不同的超音速火焰喷涂工艺参数制备WC-Co-Ni涂层;X射线衍射仪(XRD)表征涂层的相结构;压痕法表征和计算涂层的显微硬度、弹性模量和断裂韧性;电化学工作站表征NaCl溶液中涂层的电化学腐蚀性能。结果表明:喷涂过程中丙烷流量的比例较高时,焰流的温度较高,涂层中WC相的含量较低,W2C相和Co6W6C相的含量较高。当涂层中WC相含量较高时,其平均显微硬度和断裂韧性较高;当涂层中Co或Ni含量较高、Co6W6C含量较低时,其弹性模量较高。当涂层中WC相较多,涂层力学性能较均衡时,其表现出的腐蚀电流较低、传质电阻较大、抗电化学腐蚀性能较好。The WC-Co-Ni coatings were prepared by high velocity oxygen fuel(HVOF)spraying technology at different spray parameters.The X-ray diffraction(XRD)was used to characterize the phase compositions of WC-Co-Ni coatings.The indentation method was used to characterize the microhardness,elastic modulus and fracture toughness of WC-Co-Ni coatings.The electrochemical workstation was used to Characterize the electrochemical corrosion properties of WC-Co-Ni coatings in NaCl solution.The results showed that with the increased of propane flow rate,the temperature of flame was increased resulting in the decrease of WC phase and increase of W2C and Co6W6C phases.The higher contents of WC phase corresponded to a higher average microhardness and fracture toughness of coatings.The higher contents of Co or Ni phase and the lower contents of Co6W6C phase corresponded to a higher elastic modulus of coatings.The lower corrosion current and higher mass transfer resistance was obtained as the coating prepared at the proper parameters of oxygen flow rate,propane flow rate and spraying distance.The better electrochemical corrosion resistance of WC-Co-Ni coatings could be realized.

关 键 词：机械混合 电化学腐蚀 力学性能 超音速火焰喷涂 

分 类 号：TQ150.7[化学工程—电化学工业]