RE-N-C-V-Nb盐浴多元共渗H13钢的显微组织与耐腐蚀性能  

Microstructure and Corrosion Resistance of RE-N-C-V-Nb Compound Deposition on H13 Steel

作　　者：徐永礼[1] 庞祖高[2] 唐夏翔[2] 

机构地区：[1]广西水利电力职业技术学院机电工程系,南宁530023 [2]广西大学材料科学与工程学院,南宁530004

出　　处：《中国表面工程》2013年第6期57-62,共6页China Surface Engineering

基　　金：广西自然科学基金(2013GXNSFAA019303)

摘　　要：分别采用RE-N-C-V-Nb盐浴多元共渗技术和淬火+回火热处理方法制备了2种H13钢试样。利用扫描电子显微镜、X射线衍射仪观察经RE-N-C-V-Nb盐浴多元共渗处理后H13钢的显微组织结构。采用动电位极化曲线、阻抗谱等方法研究了RE-N-C-V-Nb盐浴多元共渗与淬火+回火2种方法处理后H13钢的耐腐蚀性能。结果表明:多元共渗的渗层由细小均匀、致密性好且呈弥散性分布的氮碳化合物组成;在3.0%的NaCl溶液中,其自腐蚀电位和极化电阻分别为-0.946V和1 574Ω·cm2,高于淬火+回火钢的相应值;自腐蚀电流密度和腐蚀速率分别为1.017mA/cm2和0.119 68mm/a,低于淬火+回火的相应值;其腐蚀特征以点蚀和均匀腐蚀出现,而淬火+回火钢以点腐蚀和晶间腐蚀出现。这表明H13钢经过RE-NC-V-Nb盐浴多元共渗处理后具有较高的耐腐蚀性能。Two types of H13 steel samples were treated by RE-N-C-V-Nb compound deposition and quenching b- tempering, respectively. The microstructures were observed by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Moreover, potentiodynamic polarization and electrochemical impedance spectroscopy （E/S） were used to study the corrosion resistance of the two samples. The results reveal that the coating layer of the compounded samples is composed of tiny, uniform, pyknotic and diffused V-Nb carbonitride. Its corrosion potential and polarization resistance in the 3.0% NaC1 solution are -0. 946 V and 1 574 Ω/em2 , respec- tively, which are higher than that of the quenched tempered sample. While its corrosion current density and corrosion rate are 1. 017 mA/cm2 and 0. 119 68 mm/a respectively, which are lower than that of the quenched and tempered sample. The corrosion type of the compounded sample is pitting and uniform corrosion, while the quenched ~ tempered sample shows pitting and intercrystalline corrosion. All these indicate that the RE- N-C-V-Nb compound deposition processing can obviously improve the corrosion resistance of H13 steel. Key words： H13 steel; RE-N-C-V-Nb; compound deposition; mierostructure~ corrosion resistance

关 键 词：H13钢 RE—N—C—V—Nb 多元共渗 显微组织 耐腐蚀性能 

分 类 号：TG174.445[金属学及工艺—金属表面处理]