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研制了一种含钛镍基合金,并采用X射线衍射(XRD)、扫描电镜(SEM)及能谱(EDS)等手段研究了其在850℃和950℃熔融硫酸盐中的热腐蚀行为。结果表明,热腐蚀期间,合金发生了氧化、硫化现象,合金表面腐蚀产物层可分为3层,外氧化层以Al2O3、Cr2O3和Cr2O4相为主,中间层为Al2O3相,内层为CrS和Ti2S硫化物层;随腐蚀温度提高合金表面腐蚀层的厚度增加,合金内氧化物区域和内硫化物区域加深。
A titanium-containing nickel-based alloy was developed and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) to study its hot corrosion behavior in molten sulfate at 850 ℃ and 950 ℃. The results show that during the hot corrosion, the alloy is oxidized and sulfidized. The surface corrosion layer of the alloy can be divided into three layers. The outer oxide layer is dominated by Al2O3, Cr2O3 and Cr2O4 phases, the middle layer is Al2O3 phase and the inner layer is CrS and Ti2S sulfide layer. With the increase of the etching temperature, the thickness of the corrosion layer on the alloy surface increases, and the inner oxide region and the inner sulfide region in the alloy deepen.