Influence of Sulfate Ions on Conversion of Fe(OH)&lt;SUB&gt;3&lt;/SUB&gt; Gel to &amp;beta;-FeOOH and &amp;alpha;-Fe&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;

Kanie, Kiyoshi; Muramatsu, Atsushi; Suzuki, Shigeru; Waseda, Yoshio

doi:10.2320/matertrans.45.968

Cited by 27 publications

(29 citation statements)

References 11 publications

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“…Some elements have been found to strongly influence the formation, structure, and morphology of the -FeOOH andFe 2 O 3 particles in aqueous solution systems. [5][6][7] However, further experimental studies about the effects of cations and anions on the formation of the corrosion products are essential for the investigation of the corrosion processes. Silicon (Si) is one of the most important elements of steel and often used as an alloying element so as to improve their corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe2O3

et al. 2005

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Ferric hydroxide (Fe(OH) 3 ) gel, prepared from FeCl 3 and NaOH solutions, was aged at 100 C in the presence and absence of silicate ions to examine the effect of silicate ions on the conversion process of condensed Fe(OH) 3 gel to iron oxides. The aged suspensions containing colloidal particles in each stage were separated into solid particles and supernatant solutions by centrifugation. X-ray diffraction measurements and transmission electron microscopic observations of the solid particles revealed that -FeOOH was formed from the Fe(OH) 3 gel and subsequently converted into -Fe 2 O 3 , and the addition of silicate ions in the Fe(OH) 3 gel decreased the conversion rate to -FeOOH andFe 2 O 3 particles. IR measurements of the solid particles and inductively coupled plasma analyses of the supernatant solutions showed that the adsorption of silicate ions on specific plane of the solid particles was decisive factor for the suppression of the conversion process.

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Section: Introductionmentioning

confidence: 99%

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe2O3

et al. 2005

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“…The method to prepare the corrosion product particle samples was fundamentally identical to the previous one [5,6]. 5.4 molL −1 of sodium hydrate solution was added to the same volume of 2.0 molL −1 ferric chloride solution containing 0.05 molL −1 of silicate ion or 0.30 molL −1 of sulfate ion, and the reaction solution was agitated for more than 10 min.…”

Section: Experimental a Preparation Of Powder Samplesmentioning

confidence: 99%

“…In case of coexistence of chloride ions in the solution containing ferric ions, akaganeite β-FeOOH is known to be formed by hydrolysis of ferric species and the precipitates transformed finally into hematite α-Fe 2 O 3 by thermohydrolysis [1,2]. Recently, effects of cations or anions on the formation of akaganeite and its conversion to hematite have been focused and investigated [3][4][5][6]. The results indicated that some elements strongly influence the reaction rate, formation and morphology of final products in aqueous solution systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

Shinoda

Kwon²,

Suzuki

et al. 2008

e-J. Surf. Sci. Nanotechnol.

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The EXAFS analysis of ferric oxide particles precipitated from ferric aqueous solutions including chloride ion and with/without additional anions such as sulfate or silicate. In the solution reaction process, an akaganeite (β-FeOOH)-like oxyhydroxide with low crystallinity is precipitated and subsequently transforms to hematite (α-Fe2O3). Coexistence of anion species of sulfate or silicate is effective to reduce the rate of structural transformation and influence morphology of final iron oxide products. The radial distribution functions was obtained by Fourier transformation from EXAFS spectra measured at Fe K absorption edge, and Debye-Waller factor related to Fe-Fe correlation was determined. The results indicated that the linkages with face-sharing and double-corner-sharing were influenced by adding anions in corrosion reaction solutions.

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“…13,14) It is reported that some elements strongly affect the formation and atomic-scale structures of ferric oxyhydroxides. [15][16][17][18][19][20][21][22][23] Therefore, the influence of cations and anions on the atomic-scale structures of ferric oxyhydroxides formed by iron-based alloys and steel under various environments are strongly required in order to understand the relation between the atomic-scale structures and corrosion process.…”

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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Influence of Sulfate Ions on Conversion of Fe(OH)<SUB>3</SUB> Gel to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Cited by 27 publications

References 11 publications

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

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

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Influence of Sulfate Ions on Conversion of Fe(OH)<SUB>3</SUB> Gel to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

Cited by 27 publications

References 11 publications

Effect of Silicate Ions on Conversion of Ferric Hydroxide to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

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

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Influence of Sulfate Ions on Conversion of Fe(OH)<SUB>3</SUB> Gel to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

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