通过静态质量损失实验、X射线物相分析、扫描电镜形貌观察及微区成分分析等手段, 研究了FGH95合金在650, 700和750℃下的抗熔盐热腐蚀行为及热腐蚀动力学规律.研究结果表明: FGH95合金在650℃具有较好的抗热腐蚀性; 在700和750℃下, FGH95抗热腐蚀能力下降, 腐蚀严重. FGH95热腐蚀层主要由NiO, Ni3S2,Cr2O3组成, 在700℃下腐蚀层出现NiCr2O4, 在750℃下腐蚀层出现NaCl.
The corrosion behavior and corrosion kinetics of FGH95 alloy at different temperatures were investigated by TGA, XRD, SEM and EDS. The results show that FGH95 alloy has good hot corrosion resistance characteristics at 650 ℃, and its corrosion kinetic curve obeys a parabolic rule. When the temperatures increase up to 700 and 750℃, the hot corrosion resistance of FGH95 alloy decreases and corrosion is serious. XRD, SEM and EDS indicate that the oxidized layer is mainly composed of NiO, Ni3S2 and Cr2O3, and there exists a little amount of NiCr2O4 and NaCl at 700 and 750 ℃, respectively.
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