Analysis of atmospheric corrosion products of steel and coated steel by means of scattering Mössbauer spectrometry |
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Authors: | Kiyoshi Nomura Yusuke Ujihira |
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Institution: | (1) Faculty of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113 Tokyo, Japan |
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Abstract: | Wearthering steels treated with and without zinc phosphate solution were exposed to atmosphere for 15 years and rust layers produced on the steels were analysed by scattering Mössbauer spectrometry (CEMS and XMS). γ-FeOOH, fine α-FeOOH, 5Fe2O3·9H2O, γ-Fe2O3 and Fe3O4 were identified to be present in the rust formed on the steel without phosphate coating. Large particles of γ-Fe2O3 and Fe3O4 formed on the uncoated steel exposed to atmosphere in a position facing north on vertical plane. The layer structure of rust was affected by the position. The thin rust layer formed on the phosphate + carylite resin coated steel was considered to consist of γ-FeOOH, fine α-FeOOH, and fine γ-Fe2O3. |
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