Effects of hydrogen peroxide on intergranular stress corrosion cracking of stainless steel in high temperature water, (V): Characterization of oxide film on stainless steel by multilateral surface analyses

Yohei Murayama, Tomonori Satoh, Shunsuke Uchida, Yoshiyuki Satoh, Shinji Nagata, Toshio Satoh, Yoichi Wada, Masahiko Tachibana

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The difference in electrochemical corrosion potential of stainless steel exposed to high temperature pure water containing hydrogen peroxide (H2O2) and oxygen (O2)is caused by differences in chemical form of oxide films. In order to identify differences in oxide film structures on stainless steel after exposure to H2O2and O2environments, characteristics of the oxide films have been examined by multilateral surface analyses, e.g., X-ray diffraction (XRD), Rutherford back scattering spectroscopy (RBS), secondary ion mass spectroscopy (SIMS) and X-ray photoelectron spectroscopy (XPS). Preliminary characterization results of oxide films confirmed that the oxide film formed under the H2O2 environment consists mainly of hematite (α-Fe2O2), while that under the O2environment consists of magnetite (Fe3O4). Furthermore oxidation at the very surface of the film is much more enhanced under the H2O2environment than that under the O2environment. It was speculated that metal hydroxide plays an important role in oxidation of stainless steel in the presence of H2O2. The difference in electric resistance of oxide film causes the difference in anodic polarization properties. It is recommended that several anodic polarization curves for specimens with differently oxidized films should be prepared to calculate ECP based on the Evans diagram.

Original languageEnglish
Pages (from-to)1199-1206
Number of pages8
Journaljournal of nuclear science and technology
Volume39
Issue number11
DOIs
Publication statusPublished - 2002 Nov

Keywords

  • BWR type reactors
  • Clacking
  • Electrochemical corrosion
  • Hematite
  • Hydrogen peroxide
  • Intergranular corrosion
  • Magnetite
  • Oxide film
  • Stainless steels
  • Surface characterization

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

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