| 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0.946 V和1 574 Ω·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1.017 mA/cm2和0.119 68 mm/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RENCVNb盐浴多元共渗处理后具有较高的耐腐蚀性能。 |
| 关键词: H13钢 RENCVNb 多元共渗 显微组织 耐腐蚀性能 |
| DOI：10.3969/j.issn.1007-9289.2013.06.010 |
| 分类号: |
| 基金项目: |
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| Microstructure and Corrosion Resistance of RE-N-C-V-Nb Compound Deposition on H13 Steel |
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XU Yongli, PANG Zugao, TANG Xiaxiang1,2
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1.Department of Mechanical and Electrical Engineering, Guangxi College of Water Resources and Electric Power, Nanning 530023;2.College of Material Science and Engineering, Guangxi University, Nanning 530004
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| Abstract: |
| Two types of H13 steel samples were treated by RE-N-C-V-Nb compound deposition and quenching & tempering, respectively. The microstructures were observed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Moreover, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) 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% NaCl solution are 0.946 V and 1 574 Ω/cm2, respectively, 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 RENCVNb compound deposition processing can obviously improve the corrosion resistance of H13 steel. |
| Key words: H13 steel RENCVNb compound deposition microstructure corrosion resistance |
