【摘要】 采用高速电弧喷涂技术在20G钢基体上制备了Fe-Cr-B-C-Al涂层。采用光学显微镜、扫描电镜、能谱仪、X射线衍射仪、万能材料试验机以及硬度计研究了涂层的微观组织结构和力学性能;然后在650℃条件下进行了涂层的高温腐蚀试验,并与20G钢进行了对比,研究了涂层的耐高温腐蚀机理。结果表明:高速电弧喷涂Fe-Cr-B-C-Al涂层呈典型的层状结构,与基体的结合力较强,涂层内氧化物和孔隙较少;在650℃腐蚀100h后,20G钢的腐蚀增重约为涂层的13倍;在高温腐蚀过程中,涂层表面生成了具有保护作用的氧化膜,提高了涂层的耐高温腐蚀性能。更多还原

【Abstract】 The Fe-Cr-B-C-Al coating was prepared on 20 Gsteel substrate by high velocity arc spraying(HVAS)technology.The microstructure and mechanical properties of the coating were analyzed by optical microscope(OM),scanning election microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffractometer(XRD),universal tensile testing machine and Vickers hardness tester.The high temperature corrosion test was done at 650℃ and compared with 20 Gsteel to study the high-temperature corrosion resistance of the coating.The results show that the HVAS Fe-Cr-BC-Al coating had the typical lamellar structure and combined well with the substrate.There were few oxides and pores in the coating.After corrosion at 650 ℃for 100 h,the mass gain of the 20 Gsteel was about 13 times of that of the coating.In the process of high-temperature corrosion,the protective oxide film was formed on the surface of the coating,which improved the high-temperature corrosion resistance of the coating.更多还原