Ex-situ and in-situ X-ray diffractions of corrosion products freshly formed on the surface of an iron-silicon alloy

Shigeru Suzuki, Eiichiro Matsubara, Takuya Komatsu, Yoshinori Okamoto, Kiyoshi Kanie, Atsushi Muramatsu, Horoyuki Konishi, Junichiro Mizuki, Yoshio Waseda

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Ex-situ X-ray diffraction measurements of a small amount of samples extracted from wet corrosion products freshly formed on a pure iron and iron-2 mass% silicon surfaces have been conducted using synchrotron radiation for clarifying the formation process of corrosion products. The results showed that γ-FeOOH was formed on the outer side of wet corrosion products formed on the surface of the pure iron by sodium chloride solution, while γ-FeOOH, α-FeOOH, Fe3O4, and green rusts were formed on the inner side. On the other hand, in comparison to the case of the pure iron, a significant formation of β-FeOOH was observed in the iron-silicon alloy. Influences of silicon alloying on corrosion products formed by aqueous solution containing sulfate ions were also observed. Furthermore, in-situ diffraction measurements by a conventional X-ray source were conducted for analyzing corrosion products formed on the pure iron and iron-silicon alloy surfaces by cyclic exposure to wet and dry atmospheres. The results obtained by the in-situ diffraction and ex-situ diffraction measurements on the corrosion products were consistent.

Original languageEnglish
Pages (from-to)1081-1096
Number of pages16
JournalCorrosion Science
Volume49
Issue number3
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • A. Iron
  • A. Steel
  • B. XRD
  • C. Atmospheric corrosion
  • C. Rust

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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