Structure Analysis of Cation Selective Cr-goethite as Protective Rust of Weathering Steel

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  • Konishi Hiroyuki
    Synchrotron Radiation Research Center, Kansai Research Establishment, Japan Atomic Energy Research Institute
  • Yamashita Masato
    Division of Mechanical Engineering, Graduate School of Engineering, University of Hyogo
  • Uchida Hitoshi
    Division of Mechanical Engineering, Graduate School of Engineering, University of Hyogo
  • Mizuki Jun’ichiro
    Synchrotron Radiation Research Center, Kansai Research Establishment, Japan Atomic Energy Research Institute

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We have performed extended X-ray absorption fine structure (EXAFS) analysis for artificial Cr-goethite to elucidate the local structure around Cr in Cr-goethite. The spectra were obtained using synchrotron radiation X-rays at the Photon Factory in Tsukuba. The first shell contributions were isolated by Fourier filtering the EXAFS data, and the inverse Fourier transformed single-shell data were analyzed using a curve fitting method. The results show that Cr is coordinated with (7±1) O2− ions. The protective characteristics of the Cr-goethite protective rust layer on weathering steel can be interpreted in terms of the O2− coordination around Cr3+ resulting in the creation of negative fixed charge in the Cr-goethite particles.

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