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The Enhanced Even and Pitting Corrosion Resistances of Bulk Nanocrystalline Steel in HCl Solution
Author(s) -
Wang ShengGang,
Sun Miao,
Long Kang
Publication year - 2012
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200027
Subject(s) - materials science , corrosion , nanocrystalline material , x ray photoelectron spectroscopy , pitting corrosion , metallurgy , scanning electron microscope , oxide , adsorption , composite material , chemical engineering , chemistry , nanotechnology , organic chemistry , engineering
We studied the corrosion properties of bulk nanocrystalline 304 stainless steel (BN‐SS304) produced by severe rolling technique and conventional polycrystalline 304 stainless steel (CP‐SS304) with immersion test, X‐ray photoelectron spectroscopy, ultra‐violet photoelectron spectroscopy, inductively coupled plasma emission spectrometer, and scanning electron microscope. Immersion test was carried out in 0.5 mol L −1 HCl solution for 30 days immersion interval at room temperature. It is well known that the pitting corrosion of stainless steel could be inevitable in solution containing Cl − . However, BN‐SS304 can scarcely suffer from pitting corrosion with the compact oxide film on its corrosion surface and less corrosion rate in comparison with CP‐SS304. The less corrosion rate of BN‐SS304 was attributed to the stronger O 2 adsorption and compact oxide film on its corrosion surface, its less weight of 4s–4s valence electrons and its larger work function in comparison with CP‐SS304. The improved pitting corrosion resistance of BN‐SS304 resulted from the compact oxide film, weaker Cl − adsorption and less Cl − chemical activity on its corrosion surface.