Photoelectrochemical Analysis of the Effects of pH and Sulfate Ions on the Structure and the Composition of the Passive Film Formed on Fe-20Cr-15Ni Alloy

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The effects of pH and sulfate ions on the structure and compositions of the passive film formed on Fe-20Cr-15Ni were examined using a photoelectrochemical technique and Mott-Schottky analysis. The photocurrent spectra for the passive film formed on Fe-20Cr-15Ni in the buffer solutions are composed of two spectral components, one of which is generated from Cr-substituted gamma-Fe(2)O(3) and the other of which is generated from NiO. However, the passive film formed in sulfate solutions showed only the photocurrent spectrum of Cr-substituted gamma-Fe(2)O(3), suggesting that the formation of NiO in the passive film is Suppressed because of a severe selective dissolution of Ni in the presence of sulfate ions. Mott-Schottky plots confirmed that the base structure of the passive film on Fe-20Cr-15Ni is n-type (Cr, Ni)-substituted gamma-Fe(2)O(3) regardless of solution pH and sulfate ions. The photocurrent intensity, flat band potential, and donor density for the passive film varied depending on the solution pH or the presence of sulfate ions in the solution, due primarily to the Cr enrichment in the film caused by the preferential dissolution of Fe and Ni that is more appreciable in highly acidic solutions containing sulfate ions.
Publisher
KOREAN INST METALS MATERIALS
Issue Date
2009-02
Language
English
Article Type
Article
Keywords

8.5 BUFFER SOLUTION; FERRITIC STAINLESS-STEELS; SULFURIC-ACID-SOLUTION; FE-CR ALLOYS; SEMICONDUCTING PROPERTIES; ELECTRONIC-PROPERTIES; NI; SPECTROSCOPY; ELEMENTS; STATE

Citation

METALS AND MATERIALS INTERNATIONAL, v.15, no.1, pp.57 - 62

ISSN
1598-9623
DOI
10.1007/s12540-009-0057-0
URI
http://hdl.handle.net/10203/101721
Appears in Collection
MS-Journal Papers(저널논문)
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