Title:X-Ray Photoelectron Spectroscopy Characterization for the Electrochemical Corrosion of Bulk Nanocrystalline 304 Stainless Steel in Hydrochloric Acid
Volume: 3
Issue: 2
Author(s): S.G. Wang, H.B. Han, M. Sun and K. Long
Affiliation:
Keywords:
Electronic structures, oxide film, pitting corrosion, stainless steel, X-Ray photoelectron spectroscopy.
Abstract: The electrochemical corrosion properties of bulk nanocrystalline 304 stainless steel produced by severe rolling
technique and its conventional polycrystalline 304 stainless steel were studied by immersion test for 20 days in 0.5 mol/L
HCl solution at room temperature. The corrosion rate of bulk nanocrystalline 304 stainless steel was less than that of
conventional polycrystalline 304 stainless steel. The electronic structures and compositions of the two oxide films on bulk
nanocrystalline 304 stainless steel and conventional polycrystalline 304 stainless steel in 0.5 mol/L HCl solution for 20
days’ immersion at room temperature were also studied by X-Ray Photoelectron Spectroscopy (XPS). The pitting
corrosion resistance of bulk nanocrystalline 304 stainless steel was also simultaneously enhanced in comparison to
conventional polycrystalline 304 stainless steel. These results were attributed to the better chemically stable, more
compact and thicker oxide film on bulk nanocrystalline 304 stainless steel. The better chemical stability of oxide film on
bulk nanocrystalline 304 stainless steel was due to the larger binding energies of Fe3+2p3/2, Fe2+2p3/2 and Cr3+2p3/2 in
the oxide film on bulk nanocrystalline 304 stainless steel.
