试样遮挡方式对316 L钢离子碳氮共渗渗层均匀性及防腐性能的影响  

Effects of Sample Shielding Method on Uniformity and Corrosion Resistance of 316L Steel Ion Carbonitriding Diffusion Layer

作　　者：罗建东[1] 李冉 林育周 LUO Jiandong;LI Ran;LIN Yuzhou(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510000,China;Shenzhen Huayufa Vacuum Ion Technology Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510000 [2]深圳市华宇发真空离子技术有限公司,广东深圳518000

出　　处：《热加工工艺》2023年第8期130-135,共6页Hot Working Technology

基　　金：华南理工大学科研基金项目(X2JQ-D8170170)。

摘　　要：为了改善离子碳氮共渗(PNC)过程中的边缘效应,研究了316L钢在同一工艺条件下常规离子碳氮共渗(R-PNC)、试样有部分遮挡下碳氮共渗(PC-PNC)、试样在完全遮挡下碳氮共渗(CC-PNC)时,渗层的均匀性及耐蚀性。利用光学显微镜(OM)、原子力显微镜(AFM)、CHI660E型电化学工作站等对渗层结构及耐蚀性能进行了表征。结果表明:R-PNC时,渗层边缘效应明显,试样中心无渗层,耐蚀性较差;PC-PNC时,渗层的均匀性及耐蚀性得到改善,但试样中心仍有无渗层点;CC-PNC时,试样渗层厚度显著增加,边缘效应基本消失,耐腐蚀性比PNC及PC-PNC大幅提升。遮挡方式可改变渗镀过程中试样表面的电场分布、离子运动方向与离子能量等,从而改善渗镀中存在的边缘效应。遮挡板与渗镀面之间的间距为8~10 mm时,有良好的渗镀效果,最佳遮挡间距为8 mm,优化工艺已获得生产应用。In order to improve the edge effect in the process of ion carbonitriding(PNC),the uniformity and corrosion resistance of 316L steel were studied under the same process conditions of conventional ion carbonitriding(R-PNC),the sample was carbonitriding under partial covered(PC-PNC)and the sample was carbonitriding under complete covered(CC-PNC).Optical microscope(OM),atomic force microscope(AFM)and CHI660E electrochemical workstation testing machine were used to characterize the structure and corrosion resistance of the diffusion layer.The results show that the edge effect of the diffusion layer is obvious in R-PNC,and there is no diffusion layer in the center of the sample,and the corrosion resistance is poor.Under PC-PNC,the uniformity and corrosion resistance of the diffusion layer are improved,but there is still no diffusion layer point in the center of the sample.CC-PNC significantly increases the diffusion layer thickness of the sample,the edge effect basically disappears,and the corrosion resistance is sharply improved compared with that of PNC and PC-PNC.The shielding method can change the electric field distribution,ion motion direction and ion energy of the sample surface during the carbonitriding process,so as to improve the edge effect.The nitriding effect is good when the distance between the shielding plate and the carbonitriding surface is 8-10 mm,the optimum shielding spacing is 8 mm,and the optimized technology has been applied in production.

关 键 词：试样遮挡方式 316L不锈钢 边缘效应 渗层均匀性与防腐性 氮碳共渗 

分 类 号：TG174.44[金属学及工艺—金属表面处理]