Corrosion behavior of steel under wet and dry cycles containing Cr3+ ion

Kawamata, Takayuki; Nasu, Saburo; Segi, Takashi; Tazaki, Takashi; Morimoto, Shotaro; Harada, Miyuki

doi:10.1016/s0010-938x(03)00023-4

Cited by 50 publications

(14 citation statements)

References 29 publications

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“…The diffraction patterns showed that the amounts of GR(Cl), Fe 3 O 4 , and α-FeOOH appeared to increase compared to the case of Fe. It has been reported that the addition of silicon in iron increases the formation of β-FeOOH, and the influence of silicon on the formation of β-FeOOH is likely to arise from the silicate ions with SiO 4 4− tetrahedral structural units, which interact with chloride ions contained in β-FeOOH. [10] Since phosphorus is considered to form phosphate ions like PO 4 3− tetrahedral units during corrosion, such phosphate ions may influence the formation of the above-mentioned constituent species in the corrosion products of iron.…”

Section: Xrd Patterns Of Corrosion Products Of Fe-p and Fe-momentioning

confidence: 99%

“…Intermediate iron oxides such as GRs containing ferrous ions are considered to be formed in the inner rust layer, and they are oxidized in final corrosion products, in which alloying elements may influence the formation of different constituent species formed in corrosion products. [3,4] In practice, it has been shown that in an aqueous solution, GR is transformed to Fe 3 O 4 with a spinel structure or ferric oxyhydroxides such as γ -FeOOH and α-FeOOH by oxidation, [13] and the amounts of these products depend on the reaction conditions. [13,14] These studies showed that the formation of the species depends on the temperature, partial pressure of oxygen, and reaction rates.…”

Section: γ-Feoohmentioning

confidence: 99%

“…57 Fe Mössbauer spectroscopy has also been used for analyzing constituent species containing iron in corrosion products. [3,4] However, structural analytical methods for identifying different species of corrosion products, such as α-FeOOH, γ -FeOOH, and Fe 3 O 4 , do not appear to be fully established.…”

Section: Introductionmentioning

confidence: 99%

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In situ structural analysis of corrosion products formed on the surfaces of iron‐based alloys

Suzuki

Inoue

et al. 2008

Surface & Interface Analysis

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In situ X-ray diffraction measurements were performed for analyzing the constituent species of corrosion products freshly formed on the surfaces of pure iron and iron-based alloys, namely, iron −0.58 mass% phosphorus and iron −3.2 mass% molybdenum. As these elements are often added into corrosion-resistant steels, their influence on the constituent species of the corrosion products was studied. The sample surfaces were corroded by dropping an NaCl aqueous solution and cyclically exposing them to wet and dry atmospheres. The results revealed that γ -FeOOH was formed as the main corrosion product on the surface of the iron-based alloys, and small amounts of species such as green rust (GR), and magnetite were formed depending on the addition of the alloying elements. It is considered that the formation of different constituent species of the corrosion products is influenced by the alloying elements in the corrosion products. It was shown that in situ X-ray diffraction measurements enable us to obtain information on different species in the corrosion products formed under various conditions.

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Section: Xrd Patterns Of Corrosion Products Of Fe-p and Fe-momentioning

confidence: 99%

Section: γ-Feoohmentioning

confidence: 99%

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In situ structural analysis of corrosion products formed on the surfaces of iron‐based alloys

Suzuki

Inoue

et al. 2008

Surface & Interface Analysis

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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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Corrosion behavior of steel under wet and dry cycles containing Cr3+ ion

Cited by 50 publications

References 29 publications

In situ structural analysis of corrosion products formed on the surfaces of iron‐based alloys

In situ structural analysis of corrosion products formed on the surfaces of iron‐based alloys

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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Corrosion behavior of steel under wet and dry cycles containing Cr3+ ion

Cited by 50 publications

References 29 publications

In situ structural analysis of corrosion products formed on the surfaces of iron‐based alloys

In situ structural analysis of corrosion products formed on the surfaces of iron‐based alloys

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