Study on Oxidation Behavior of Iron-based Alloys Based on X-ray Photoelectron Spectroscopy
Currently,iron(Fe)is one of the most widely used metals in various service environments.However,in the presence of oxygen,iron-based materials exhibit different degrees and forms of oxidation,and an oxide layer with a certain thickness will be formed on the surface.Previous study shows that the oxidation resistance of iron-based materials can be effectively improved by adding elements to form alloys.Nevertheless,there is still a lack of related investigation on revealing the initial stage of oxidation of iron-based alloys.Based on scanning electron microscope(SEM),energy dispersive spectroscopy(EDS)and X-ray photoelectron spectroscopy(XPS),the morphology,elements and valence states of oxides formed on the surface of iron-based materials at room temperature and high temperature were investigated after Si,Cr,Mn and other elements were added.The results showed that Fe-based alloys have different oxidation behaviors at room temperature and high temperature in an oxygen-containing environment.Fe will be naturally oxidized to form Fe2O3 thin films with a thickness of nanometer scale at room temperature.At high temperatures,the elements will be oxidized according to the priority of Si＞Mn＞Cr＞Fe,and a Si-Mn-Cr-Fe-O composite film will be formed on the surface,which will hinder the outward diffusion of Fe elements and improve the oxidation resistance.Increasing the content of Cr element can effectively improve the oxidation resistance of iron-based alloys.The XPS technology can effectively overcome the drawback that the probing depth of XRD is too deep to accurately characterize the phase of oxide films on the surface of iron-based alloys.Moreover,it can analyze the chemical composition and state of nano-scale films,which provides technical guidelines for future study of metal oxide films.
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