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采用高速电弧喷涂工艺在45钢基体上制备FeCrNiB/Cr3C2涂层。采用光学显微镜、扫描电镜和X射线衍射等手段分析了涂层微观组织和相组成。在650℃下研究了涂层的涂盐热腐蚀行为,腐蚀介质选用质量比为75∶25的Na2SO4+NaCl混合盐,并与20G钢作对比研究。结果表明,涂层具有典型的层状结构特征,致密且连续,涂层的抗热腐蚀性能都要优于20G钢。在650℃下涂层表面形成了Fe2O3、Cr2O3和FeCr2O4等致密的氧化膜,阻碍了熔盐的侵入,提高了涂层抗热腐蚀性能。
FeCrNiB / Cr3C2 coatings were prepared on 45 steel substrates by high speed arc spraying. The microstructure and phase composition of the coatings were analyzed by optical microscopy, scanning electron microscopy and X-ray diffraction. The hot corrosion behavior of coated salt was investigated at 650 ℃. The mixed solution of Na2SO4 + NaCl with mass ratio of 75:25 was selected as corrosive medium and compared with 20G steel. The results show that the coating has the typical layered structure characteristics, dense and continuous, the corrosion resistance of the coating should be better than the 20G steel. The dense oxide films such as Fe2O3, Cr2O3 and FeCr2O4 were formed on the surface of the coating at 650 ℃, hindered the intrusion of molten salt and improved the hot corrosion resistance of the coating.