真空热处理对NiCrAlY涂层耐腐蚀性的影响  

Effects of vacuum heat treatment on corrosion resistance of NiCrAlY coating

作　　者：魏旭敏 杨德明[1] 蔡林 魏宇廷 高阳[1] WEI Xumin;YANG Deming;CAI Lin;WEI Yuting;GAO Yang(Department of Materials Science and Engineering,Dalian Maritime University,Dalian 116000,China;Dalian Huarui Heavy Industry Group Co.Ltd.,Dalian 116041,China;Department of Agricultural Engineering Information Technology,Dalian Ocean University,Dalian 116000,China)

机构地区：[1]大连海事大学材料科学与工程系,辽宁大连116000 [2]大连华锐重工特种备件制造有限公司,辽宁大连1160041 [3]大连海洋大学农业工程信息技术系,辽宁大连116000

出　　处：《兵器材料科学与工程》2022年第3期66-70,共5页Ordnance Material Science and Engineering

基　　金：大连市高层次人才创新支持计划(青年科技之星)(2018RQ53)。

摘　　要：为提高质子交换膜燃料电池(PEMFC)双极板的耐腐蚀性,用超音速火焰喷涂(HVOF)制备NiCrAlY涂层,涂层经不同温度真空热处理,用扫描电镜、X射线衍射和电化学工作站研究涂层组织与耐腐蚀性的关系。结果表明:经1200℃真空热处理的NiCrAlY涂层耐腐蚀性最好,因为随真空热处理的温度提升,涂层致密度提高,减少了结构缺陷和成分偏析;涂层的β-NiAl相组织粗化,出现新相γ′-Ni3Al相且组织细化、数量增多,为Al扩散提供有利条件。In order to improve the corrosion resistance of proton exchange membrane fuel cell(PEMFC)bipolar plate,NiCrAlY coating was prepared by high-velocity oxygen-fuel(HVOF),and the coating was subjected to vacuum heat treatment at different temperatures.The relationship between the coating structure and corrosion resistance was studied by scanning electron microscope,X-ray diffraction and electrochemical workstation.The results show that the NiCrAlY coating has the best corrosion resistance after heat treatment at 1200℃.This is attributed to that with the increase of the temperature of vacuum heat treatment,the density of the coating is improved,and the influence of structural defects and component segregation is reduced.The microstructure ofβ-NiAl phase is coarsening,and the newγ′-Ni3Al phase appears with finer microstructure and increased number,which provides favorable conditions for Al diffusion.

关 键 词：质子交换膜燃料电池 双极板 超音速火焰喷涂 NICRALY 真空热处理 

分 类 号：TG178[金属学及工艺—金属表面处理]