Chemical states in oxide films on stainless steel treated in supercritical water factor analysis of X-ray photoelectron spectra

Tomoo Yamamura; Naoki Okuyama; Yoshinobu Shiokawa; Masaoki Oku; Hiroshi Tomiyasu; Wataru Sugiyama

doi:10.1149/1.2098347

Chemical states in oxide films on stainless steel treated in supercritical water factor analysis of X-ray photoelectron spectra

Tomoo Yamamura, Naoki Okuyama, Yoshinobu Shiokawa, Masaoki Oku, Hiroshi Tomiyasu, Wataru Sugiyama

International Research Center for Nuclear Materials Science

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

A preliminary study of the corrosion films of stainless steel SUS304 was carried out by X-ray photoemission spectroscopy for supercritical water having no oxidant or reactant. The corrosion films produced by the supercritical water at 450°C and 50 MPa were compared with those by anodic polarization in H ₂SO ₄ aqueous solution. The chemical states in the films were determined by factor analysis of Fe, Cr, and Ni 2p X-ray photoelectron spectra. Factor analysis of the passivated SUS304 surface was successfully carried out using four reference spectra, Fe metal, Fe ₃O ₄, Fe ₂O ₃, and FeOOH, with careful treatment excluding wüstite Fe _1-xO phase from the standpoint of thermochemistry. In the surface treated by supercritical water, the ratio of iron and nickel increased even when compared to the bulk composition of SUS304 and the major component of nickel was attributed to NiFe ₂O ₄. In contrast, the content of chromium decreased remarkably. This was explained by effective removal of CrO ₄ ^2- and its protonated form, HCrO ₄ ^-, which are predicted in the Pourbaix diagram prepared for chromium in supercritical water (450°C and 50 MPa).

Original language	English
Pages (from-to)	B540-B546
Journal	Journal of the Electrochemical Society
Volume	152
Issue number	12
DOIs	https://doi.org/10.1149/1.2098347
Publication status	Published - 2005

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following Sustainable Development Goal(s)

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Chemical states in oxide films on stainless steel treated in supercritical water factor analysis of X-ray photoelectron spectra. / Yamamura, Tomoo; Okuyama, Naoki; Shiokawa, Yoshinobu; Oku, Masaoki; Tomiyasu, Hiroshi; Sugiyama, Wataru.

In: Journal of the Electrochemical Society, Vol. 152, No. 12, 2005, p. B540-B546.

Research output: Contribution to journal › Article › peer-review

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title = "Chemical states in oxide films on stainless steel treated in supercritical water factor analysis of X-ray photoelectron spectra",

abstract = "A preliminary study of the corrosion films of stainless steel SUS304 was carried out by X-ray photoemission spectroscopy for supercritical water having no oxidant or reactant. The corrosion films produced by the supercritical water at 450°C and 50 MPa were compared with those by anodic polarization in H 2SO 4 aqueous solution. The chemical states in the films were determined by factor analysis of Fe, Cr, and Ni 2p X-ray photoelectron spectra. Factor analysis of the passivated SUS304 surface was successfully carried out using four reference spectra, Fe metal, Fe 3O 4, Fe 2O 3, and FeOOH, with careful treatment excluding w{\"u}stite Fe 1-xO phase from the standpoint of thermochemistry. In the surface treated by supercritical water, the ratio of iron and nickel increased even when compared to the bulk composition of SUS304 and the major component of nickel was attributed to NiFe 2O 4. In contrast, the content of chromium decreased remarkably. This was explained by effective removal of CrO 4 2- and its protonated form, HCrO 4 -, which are predicted in the Pourbaix diagram prepared for chromium in supercritical water (450°C and 50 MPa).",

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AU - Tomiyasu, Hiroshi

AU - Sugiyama, Wataru

PY - 2005

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AB - A preliminary study of the corrosion films of stainless steel SUS304 was carried out by X-ray photoemission spectroscopy for supercritical water having no oxidant or reactant. The corrosion films produced by the supercritical water at 450°C and 50 MPa were compared with those by anodic polarization in H 2SO 4 aqueous solution. The chemical states in the films were determined by factor analysis of Fe, Cr, and Ni 2p X-ray photoelectron spectra. Factor analysis of the passivated SUS304 surface was successfully carried out using four reference spectra, Fe metal, Fe 3O 4, Fe 2O 3, and FeOOH, with careful treatment excluding wüstite Fe 1-xO phase from the standpoint of thermochemistry. In the surface treated by supercritical water, the ratio of iron and nickel increased even when compared to the bulk composition of SUS304 and the major component of nickel was attributed to NiFe 2O 4. In contrast, the content of chromium decreased remarkably. This was explained by effective removal of CrO 4 2- and its protonated form, HCrO 4 -, which are predicted in the Pourbaix diagram prepared for chromium in supercritical water (450°C and 50 MPa).

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Chemical states in oxide films on stainless steel treated in supercritical water factor analysis of X-ray photoelectron spectra

Abstract

ASJC Scopus subject areas

UN SDGs

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