In Situ Analysis of Pitting Corrosion in Artificial Crevice of Stainless Steel by X-ray Absorption Fine Structure

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概要

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• A new technique by XAFS (X-ray Absorption Fine Structures) and XANES (X-ray Absorption Near Edge Structures) has been developed for in situ observation of metal corrosion. XAFS and XANES spectra were obtained with a special electrochemical cell to elucidate pitting for stainless steel. A sheet of stainless steel was attached below a reservoir of a specific aqueous environment with thin films. The solution in the reservoir attached to the metal thorough the film, and the solution inside the film corresponds to an artificial pit. X-ray beams pass through the film containing the solution, and XAFS and XANES measurements were performed in a transparent geometry with keeping the specimen at a pitting potential. Measurements were performed for Cr-K, Mo-K, Cl-K and Br-K edges, and changes of concentrations and coordination states of ions were successfully obtained as a function of the distance (d(z)) from the metal/solution interface.Concentrations of chromium and bromide ions inside the artificial crevice of Fe-18Cr-12Ni-2Mo (mass%) alloy shows a linear dependence on the distance d(z). Structures of bromide ion were changed with positions; the distance between bromide ion and the nearest-neighboring ion at a position near the interface was shorter than that at a position far from the interface. This indicates the formation of hydrobromo-complex near the metal/solution interface.The state of molybdenum inside the artificial crevice of Fe-18Cr-20Ni-5Mo (mass%) alloy was investigated using two solutions: LiCl and LiBr. The formation of the [MoO4(H2O)2]2− octahedra was observed in both solutions, but there was observed a significant difference in networking of the octahedral. In LiCl solutions it was similar to that of molybdate ions (MoO42−), but in LiBr it was rather different form that of molybdate ions. This shows that the favorable effects of molybdenum can be attributed to the formation of MoO42− network near the interface.

• 社団法人 日本鉄鋼協会の論文
• 2002-12-15

著者

• KIMURA Masao

  Advanced Technology Research Laboratories, Nippon Steel Corporation

• Kimura Masao

  Advanced Technology Research Laboratory Nippon Steel Corp

• Kaneko Michio

  Steel Research Laboratory Nippon Steel Corp

• OHTA Noriaki

  Nippon Steel Technoresearch Corp

• Kimura Masao

  Advanced Technology Research Laboratories Nippon Steel Corporation

関連論文

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• Generalized Grazing Incidence-Angle X-Ray Diffraction Studies on InAs Quantum Dots on Si(100) Substrates
• Characterization of Nanostructure of Rusts Formed on Weathering Steel
• In Situ Analysis of Pitting Corrosion in Artificial Crevice of Stainless Steel by X-ray Absorption Fine Structure
• Effects of S Content and Surface Finish on Pitting Corrosion of Austenitic Stainless Steels Containing Mo in Chloride and Bromide Solutions

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