新型含铝高铬铸铁的高温抗氟腐蚀性能

High temperature fluoride corrosion resistance of aluminum-containing high chromium cast iron

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。

Corrosion kinetics curves of the high-chromium cast irons were measured with mass loss method,the surface morphology and composition of the corrosion film were investigated by scanning electron microscopy（SEM） combing with energy spectrum analysis（EDS）.The phase composition of the corrosion film was analyzed with X-ray diffractometer（XRD）.Moreover,the depth distribution of elements was studied combining with the Auger electron spectroscope（AES）.Corrosion resistance mechanism of new aluminum containing high-chromium cast iron in HF atmosphere at 900 ℃ was discussed.The results show that conventional high-chromium cast iron can not form a dense film with good protection due to the reaction of HF gas,but the new cast iron forms compact surface and good adhesion of oxygen / fluoride film due to presence of aluminum element,which provide a good protection for the matrix.