316L不锈钢等离子熔覆Ni基合金涂层的组织与性能  

Microstructure and corrosion resistance of Ni-based alloy coating by plasma cladding on 316L stainless steel

作　　者：彭竹琴[1] 王红芳[1] 卢金斌[1] 弓金霞[1] 

机构地区：[1]中原工学院材料与化工学院,郑州450007

出　　处：《焊接学报》2011年第3期89-92,117-118,共4页Transactions of The China Welding Institution

基　　金：河南省基础与前沿技术研究计划项目(072300440020)

摘　　要：利用等离子熔覆工艺在316L不锈钢基体上熔覆Ni基合金粉末制备耐磨耐蚀涂层,借助于金相显微镜、扫描电镜、X射线衍射仪分析了涂层的组织,利用显微硬度计测试了涂层的显微硬度,采用线性极化法研究了涂层在3.5%NaCl溶液中的耐蚀性能.结果表明,Ni基合金涂层组织主要为固溶大量Cr和Si元素的枝晶γ-(Ni,Fe)及Cr23C6相.涂层的显微硬度可达400～440 HV0.2,明显高于基体硬度(170～200 HV0.2),起到了显著的硬化效果。在3.5%NaCl溶液介质中,涂层的腐蚀电位负移约178 mV,基体的击破电位0.1 V高于熔覆层的击破电位-0.1V,说明该腐蚀体系下镍基合金涂层的耐腐蚀性能低于316L不锈钢基体.A wear-resistant and corrosion-resistant coating was prepared by plasma cladding on 316L stainless steel with Ni-based alloy powder.The microstructure of the coating was investigated by optical microscope(OM),scanning electron microscopy(SEM) with energy dispersive spectroscopy(EDS),X-Ray diffractometer(XRD).The microhardness of the coating was tested by microhardness tester.The corrosion resistance of the coating in 3.5% NaCl solution was evaluated by linear polarization.The results showed that the microstructure of the coating consisted of dendritic γ-(Ni,Fe) solid solution and Cr23C6.The microhardness of the coating varied from 400 HV0.2 to 440 HV0.2,greater than that of the substrate(170～200 HV0.2).The corrosion potential of the coating in 3.5% NaCl solution moved reversely 178 mV,the breakdown potential(0.1 V)of the substrate was higher than that of coating(-0.1 V),which demonstrated the corrosion resistance of the substrate was better than coating.

关 键 词：等离子熔覆 NI基合金 组织 耐蚀性 

分 类 号：TG142[一般工业技术—材料科学与工程]