摘要
金属表面双辉低温等离子渗铬可提高金属耐蚀性,且不损坏其组织和性能等。在650℃对40Cr钢表面进行双辉低温等离子渗铬,采用光学显微镜、扫描电镜、能谱仪、辉光放电剥层成分分析仪、X射线衍射仪及电化学腐蚀性能测试对渗铬试样的形貌、成分、元素分布、相结构和耐蚀性能等进行了研究。结果表明:40Cr表面沉积层厚4～5μm,沉积层与基体间出现少量的脱碳层,基体组织均匀、晶粒细小;渗镀试样内铬元素呈梯度分布;基材渗铬后表面铬含量提高,渗铬试样氮化后表层物相以CrN为主;与基材相比,渗铬试样在1mol/LNaCl溶液中的抗点蚀能力增强,耐腐蚀性能提高。
40Cr steel was chromized with double glow plasma at relatively low temperature. The morphology,composition,elemental distribution and phase composition of the chromizing coating were analyzed by using an optical microscope,a scanning electron microscope,an energy dispersive spectrometer,a glow discharge composition analyzer and an X-ray diffractometer. At the same time,the corrosion resistance of the chromizing coating was evaluated by using an electrochemical facility. Results show that the chromizing coating on the surface of 40Cr steel was about 4～5 μm thick. A small amount of decarbonization layer was generated at the interface of chromizing coating-substrate,and the substrate was composed of fine grains. Cr in the chromizing coating had gradient distribution. Moreover,after nitriding of the chromizing coating,CrN emerged as the major phase on surface,where Cr content was higher than that in the bulk steel. As compared with the steel substrate,the chromizing coating had better anti-pitting ability in 1 mol/L NaCl solution,showing increased corrosion resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第5期67-69,共3页
Materials Protection
基金
国家自然科学基金项目(50764002)
信息材料广西重点实验室主任研究课题(桂科能0710908-06-Z)
广西区自然科学基金项目(桂科自0728207)
国家大学生创新项目(081059517)
关键词
双辉低温等离子渗铬
40Cr
结构
耐蚀性
double glow plasma chromizing
40Cr
microstructure
corrosion resistance
