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Nasu, Saburo; Tazaki, Takashi

doi:10.1023/a:1021227223736

Cited by 17 publications

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“…The spectra observed at 10 K were analyzed into three sextets by a least-square-fit; one is due to γ -Fe 2 O 3 having B int = 52 T, another is due to α-FeOOH having B int = 50 T, and the other can be γ -FeOOH having B int = 47 T, which is slightly larger than B int reported for the synthesized γ -FeOOH 42,44) and the obtained γ -FeOOH in the rust formed on the weathering steel as mentioned above. It is therefore undeniable that a small amount of ferrihydrite may contribute to this spectrum, whereas the Mössbauer spectrum of ferrihydrite is not yet clear.…”

Section: Mössbauer Spectroscopy Of the Inner And The Outer Rust Figurmentioning

confidence: 94%

“…It is therefore undeniable that a small amount of ferrihydrite may contribute to this spectrum, whereas the Mössbauer spectrum of ferrihydrite is not yet clear. [45][46][47] 4. Discussion 4.1 X-ray amorphous substance in rust formed on mild steel Magnetite (Fe 3 O 4 ) and magnetite (γ -Fe 2 O 3 ) were not observed in the rust formed on the mild steel used in this study by means of XRD as shown in Fig.…”

Section: Mössbauer Spectroscopy Of the Inner And The Outer Rust Figurmentioning

confidence: 99%

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Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Kawamata¹,

Nasu

Tazaki

et al. 2002

Mater. Trans.

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The rusts formed on mild steel (15-year exposure) and weathering steel (32-year exposure) exposed to an industrial environment have been characterized by means of X-ray diffraction technique and 57 Fe Mössbauer spectroscopy. By using an X-ray diffraction method, it is suggested that the rusts formed on both steels consist of the crystalline α-FeOOH, γ -FeOOH and an X-ray amorphous phase, which gives no peak to X-ray diffraction pattern. The amount of the X-ray amorphous phase exceeds 50% of the total amount of the rust. The 57 Fe Mössbauer spectra observed at 10 K indicate that the rust contains only α-FeOOH, γ -FeOOH and Fe 3−δ O 4 (γ -Fe 2 O 3 ) for mild steel, and only α-FeOOH and γ -FeOOH for weathering steel. The X-ray amorphous substance in the rust layer formed on mild steel possesses the structures of mainly α-FeOOH showing superparamagnetism owing to its small particle size, and Fe 3−δ O 4 (γ -Fe 2 O 3 ). They are contained both in the inner rust layer and in the outer rust layer. The X-ray amorphous phase in the rust layer formed on weathering steel is mainly α-FeOOH.

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Section: Mössbauer Spectroscopy Of the Inner And The Outer Rust Figurmentioning

confidence: 94%

Section: Mössbauer Spectroscopy Of the Inner And The Outer Rust Figurmentioning

confidence: 99%

Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Kawamata¹,

Nasu

Tazaki

et al. 2002

Mater. Trans.

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“…Typically, a protective layer formed on the surface of weathering steel reduces the corrosion rate. [3][4][5][6][7][8][9] Therefore, the atomic-scale structure and morphology of corrosion products are very important for understanding the corrosion mechanism. This is because they are closely related to the corrosion process on the surface of iron-based alloys and steel.…”

Section: Introductionmentioning

confidence: 99%

Atomic-scale Structure of Ferric Oxyhydroxide Formed from Fe–Si Alloy in Aqueous Solutions Containing Different Salts

et al. 2006

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Quantitative X-ray structural analysis coupled with reverse Monte Carlo (RMC) simulation was performed for characterizing the atomic-scale structure of g-FeOOH (lepidocrocite) particles. These particles were formed by dipping pure iron or Fe-2mass%Si alloy into aqueous solutions containing Na 2 SO 4 or NaCl. The realistic atomic-scale structures of g-FeOOH particles were estimated by fitting ordinary interference functions through the RMC simulation technique. The results revealed that the fundamental FeO 6 octahedral structural units and their linkages were distorted in the g-FeOOH particles formed from the Fe-Si alloy. This distortion was considered to be caused by the incorporation of silicate species into these particles. Transmission electron microscopy and Fourier-transform infrared (FT-IR) spectroscopy were employed for observing the morphology of the particles and for characterizing their bonding structure, respectively. Further, the amount of g-FeOOH particles formed was measured in order to investigate their formation processes. The changes in the pH and oxidation-reduction potential (ORP) of the solutions were monitored during the formation of g-FeOOH particles. Inductively coupled plasma analyses were also performed for determining the amounts of iron and silicon in supernatant solutions. The results indicated that the formation process of gFeOOH particles in the solutions was influenced by the addition of silicon to iron.KEY WORDS: ferric oxyhydroxide; lepidocrocite; X-ray diffraction; atomic-scale structure.

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“…Typically, a protective rust layer is formed on the surface of weathering steel, and the layer is known to considerably reduce the corrosion rate of weathering steel. [3][4][5][6][7][8] The mechanism of atmospheric corrosion has been discussed on the basis of electrochemical reactions, and electrochemical methods and other techniques were utilized for studying reaction processes in atmospheric corrosion. [9][10][11][12][13] It was considered in these works that the anodic metal dissolution reaction is balanced by the cathodic reaction during corrosion, and the reduction and re-oxidation of corrosion products of ferric and ferrous ions can occur in water.…”

Section: Introductionmentioning

confidence: 99%

<I>In-situ</I> X-ray Diffraction of Corrosion Products Formed on Iron Surfaces

et al. 2005

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In-situ X-ray diffraction measurements by synchrotron radiation and conventional X-ray source have been carried out for identifying constituent species of corrosion products, which were formed on the surface of a pure iron and an iron-5 mass% nickel alloy by reaction with aqueous solutions containing sodium chloride or sodium sulfate. A cell has been prepared for in-situ diffraction measurements of the corrosion products. Diffraction patterns from the corrosion products showed that major constituent species of the corrosion products was -FeOOH, and the fraction of minor species of -FeOOH and Fe 3 O 4 in the corrosion products depended on corrosion conditions, such as wetting and drying processes, anion species in aqueous solutions and nickel in the sample. An oxide scale thermally formed on the iron surface was also found to affect the formation of corrosion products.

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Cited by 17 publications

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Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Atomic-scale Structure of Ferric Oxyhydroxide Formed from Fe–Si Alloy in Aqueous Solutions Containing Different Salts

<I>In-situ</I> X-ray Diffraction of Corrosion Products Formed on Iron Surfaces

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Cited by 17 publications

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M&ouml;ssbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

M&ouml;ssbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Atomic-scale Structure of Ferric Oxyhydroxide Formed from Fe&ndash;Si Alloy in Aqueous Solutions Containing Different Salts

<I>In-situ</I> X-ray Diffraction of Corrosion Products Formed on Iron Surfaces

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Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Atomic-scale Structure of Ferric Oxyhydroxide Formed from Fe–Si Alloy in Aqueous Solutions Containing Different Salts