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用质量损失法测绘了新型含铝高铬铸铁的高温氟腐蚀动力学曲线,利用扫描电子显微镜(SEM)观察了腐蚀膜表面形貌,采用X射线衍射仪(XRD)分析了高铬铸铁腐蚀膜物相组成,并结合俄歇电子能谱仪(AES)分析了深度成分分布。在此基础上,研究了新型含铝高铬铸铁在900℃含HF气氛中的耐腐蚀机理。研究表明,由于HF气体的作用,传统高铬铸铁无法形成致密性较好的保护膜,而新型铸铁由于含A l,在表面形成致密性和黏附性很好的氧/氟化膜,对基体起到了很好的保护作用。
The high temperature corrosion kinetics curves of high chromium cast iron containing aluminum were plotted by mass loss method. The surface morphology of the corrosion film was observed by scanning electron microscope (SEM). The corrosion resistance of high chromium cast iron corrosion film was analyzed by X-ray diffraction (XRD) Phase composition, and combined with Auger electron spectroscopy (AES) analysis of the depth component distribution. On this basis, the corrosion resistance mechanism of the new aluminum-containing high-chromium cast iron in HF atmosphere containing 900 ℃ was studied. The research shows that due to the effect of HF gas, the traditional high-chromium cast iron can not form a dense dense protective film. Because of the inclusion of Al, the new cast iron forms an oxygen / fluoride film with good compactness and adhesion on the surface, Played a good protective effect.