采用高速电弧喷涂工艺在低碳钢基体表面制备了FeNiCr/Cr3C2和NiCrTi两种电弧喷涂涂层。通过光学显微镜对涂层的显微组织进行了观察研究。试验选用摩尔比为7：3的Na2SO4＋K2SO4饱和水溶液涂刷在涂层表面,在700℃的条件下进行了156 h的热腐蚀试验。通过腐蚀动力学测试对电弧喷涂涂层的抗热腐蚀性能进行了评估。采用了X射线衍射,扫描电镜和能谱分析技术对热腐蚀机理进行了探讨。结果表明,两种电弧喷涂涂层具有致密的层状结构,涂层中含有少量空隙。在涂层表面生成的连续致密的氧化膜使得NiCrTi涂层具有良好的抗热腐蚀性能。FeNiCr/Cr3C2涂层则遭受了较严重的氧化腐蚀和硫化腐蚀,并且有内硫化物析出,抗热腐蚀性能较差。
FeNiCr/Cr3C2 and NiCrTi coatings were deposited onto mild steel substrate Q235 by high velocity electric arc spraying process.Microstructure of the coatings was characterized using optical microscopy.Hot corrosion resistance of the coatings was evaluated by measurement of corrosion mass gain in a mixed molten salt of Na2SO4 and K2SO4（7∶3） at 700 ℃ for 156 h and the hot corrosion behavior of the coatings was investigated by scanning election microscopy（SEM）,X-ray diffraction（XRD） and energy dispersive spectroscopy（EDS）.The results indicate that the coatings have a layered structure with some pores.The hot corrosion resistance of the NiCrTi coating is higher than that of the FeNiCr/Cr3C2 coating due to the formation of oxides and spinels of chromium and aluminum on exposed surface of NiCrTi coating.The hot corrosion of the FeNiCr/Cr3C2 coating occurs by the mechanism of oxidation,sulfidation and internal sulfidation.
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