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用高速电弧喷涂技术和自行研发的FeMnCrAl/Cr3C2粉芯丝材,在20钢样品表面制备了FeMnCrAl/Cr3C2涂层,采用光学显微镜、场发射扫描电镜、能谱分析和X射线衍射等方法,对FeMnCrAl/Cr3C2涂层的显微组织和热腐蚀行为进行了研究,并与20钢做了对比试验研究。结果表明:FeMnCrAl/Cr3C2涂层主要由固溶相的凝片叠加组成,中间夹杂着氧化物相、未熔颗粒相和孔隙;FeMnCrAl/Cr3C2涂层抗热腐蚀性能明显优于20钢基体,热腐蚀增重约为20钢的1/3-1/4,涂层抗腐蚀性能提高的原因主要是:涂层热腐蚀后表面生成具有保护性的、致密的含Al、Cr氧化物和Cr与Fe的复合氧化物,阻碍了涂层进一步腐蚀。
FeMnCrAl / Cr3C2 coatings were prepared on the surface of 20 steel by high speed arc spraying and self-developed FeMnCrAl / Cr3C2 cored wire. Optical microscope, field emission scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction The microstructure and hot corrosion behavior of FeMnCrAl / Cr3C2 coatings were investigated and compared with that of 20 steel. The results show that the FeMnCrAl / Cr3C2 coatings mainly consist of superposition of the solid solution phase and the oxide phase, the unmelted particle phase and the pores. FeMnCrAl / Cr3C2 coating has better hot corrosion resistance than the 20 steel substrate. The corrosion weight gain is about 1 / 3-1 / 4 of 20 steel. The reasons for the improvement of the corrosion resistance of the coating mainly include that the surface of the coating is hot-oxidized and has a protective and dense surface containing Al, Cr oxides and Cr Fe composite oxide, hinder the coating further corrosion.