The Electronic Structure Characterization Surface Of Oxide Film On Corrosion Of Stainless

The oxide film electronic structure of nanocrystalline 304 stainless steel(BN-SS304) and conventional polycrystalline 304 stainless steel(CP-SS304) after at room temperature soaking in different concentration of hydrochloric acid solution by X-ray photoelectron spectroscopy(XPS).The metal atoms binding energy of nanocrystalline 304 stainless steel is always higher than the corresponding atoms ofconventional polycrystalline 304 stainless steel, illustrate nanocrystalline 304 stainless steel oxide filmchemical durability and resistant corrosion were more stable than conventional polycrystalline 304 stainless steel.By spectrum and valence of nanocrystalline 304 stainless steel and conventional polycrystalline 304 stainless steel,two materials oxidation film element types are the same contain C, O, Cl, Fe, Cr and Ni element.With the increase of sputtering time, the valence spectrum of nanocrystalline 304 stainless steel compared with the conventional polycrystalline 304 stainless steel valence happenedright sizing.By spectrum of nanocrystalline 304 stainless steel and conventional polycrystalline 304 stainless steel, the O atom percentage of conventional polycrystalline 304 stainless steel is forty-five percent, the O atom percentage of nanocrystalline 304 stainless steel is thirty percent.The oxidation film surface of nanocrystalline 304 stainless steel more dense and hindered the further corrosion of acid solutionfor the substrate form a protective effect.The binding energy of chloride ion in nanocrystalline 304 stainless steel in the oxide film is always higher than conventional polycrystalline 304 stainless steel,which shown that the oxide film of nanocrystalline 304 stainless steel have better chemical stability to reduced the pitting corrosion rate and protectthe matrix to improved corrosion resistance.The chloride ion content in the oxide film percentage of nanocrystalline 304 stainless steel is higher than the conventional polycrystalline 304 stainless steel make pitting corrosion occurred more easily.