&lt;I&gt;In-situ&lt;/I&gt; X-ray Diffraction of Corrosion Products Formed on Iron Surfaces

Takahashi, Yohei; Matsubara, Eiichiro; Suzuki, Shigeru; Okamoto, Yoshinori; Komatsu, Takahiro; Konishi, Hiroyuki; Мizuki, J.; Waseda, Yoshio

doi:10.2320/matertrans.46.637

Cited by 45 publications

(30 citation statements)

References 19 publications

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“…It has been found in the layer between the upper layer of the corrosion products and the metallic iron substrate. 12,13) Therefore, GR is transformed into the iron oxyhydroxides and oxides through the dissolution and precipitation of the ferrous and ferric ions in an aqueous solution. The species and morphologies of these iron oxyhydroxides and oxides in the corrosion products may be determined by the environmental reaction conditions and the incorporation of foreign cations and anions.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Behavior of Nickel Ions during Transformation of Green Rust to Ferric Oxyhydroxides in Aqueous Solution

et al. 2008

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X-ray diffraction, transmission electron microscopy, and X-ray absorption spectroscopy were used for characterizing the role of nickel in the transformation of Green Rrust 2(SO 4 2À ) (GR2). GR2(SO 4 2À ) was synthesized from the solution of ferric and ferrous sulfate and that of sodium hydroxide. The suspension containing GR2(SO 4 2À ) with and without nickel was oxidized by passing oxygen gas into the aqueous solution, in which GR2(SO 4 2À ) was transformed into ferric oxyhydroxides. The pH and oxidation reduction potential (ORP) values of the aqueous solution were monitored during the transformation of GR2(SO 4 2À ). In addition, the concentrations of iron and nickel in the solution during the transformation of GR2(SO 4 2À ) were analyzed by using inductively coupled plasma atomic emission spectroscopy. The reaction conditions of the GR2(SO 4 2À ) suspension were found to be strongly influenced by the addition of nickel. The reaction product goethite, which was transformed from GR2(SO 4 2À ), also appeared to be stabilized by the addition of nickel. These results indicate that the species of the solid particles formed in the solution are controlled by the addition of foreign elements.

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Section: Introductionmentioning

confidence: 99%

Characteristic Behavior of Nickel Ions during Transformation of Green Rust to Ferric Oxyhydroxides in Aqueous Solution

et al. 2008

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“…Chloride containing corrosion products are then very often detected on iron and copper objects [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…acids, bases and salts), thus many researchers have been involved in studies of the corrosion process in such media [5][6][7][8]. In the literature, the identification of the corrosion products is provided mainly by methods such as X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy combined with an electron microprobe (SEM-EDS), less frequently infrared spectroscopy (IR) and the Raman spectroscopy (RS) [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Identification of Corrosion Products on Fe and Cu Metals using Spectroscopic Methods

et al. 2018

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In this study, the Fourier-transform infrared absorption and the Raman spectroscopies for analysis of corrosion products formed on the Fe and Cu metal surfaces after deposition in the chloride containing solution, were used. The obtained spectral patterns show that main constituent species of the corrosion products for Fe metal sample is lepidocrocite, while in the case of Cu surface there is formed mainly paratacamite. The obtained results confirm that application of vibrational spectroscopic methods is precise tool for identification and analysis of the corrosion products.

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“…6,7) Since GR is stable in an aqueous solution of relatively low potential, it is transformed into the iron oxyhydroxides and oxides through the dissolution and precipitation of Fe(II) and Fe(III) ions in an aqueous solution by oxygen gas in air. [8][9][10][11][12][13] Therefore, it is important to elucidate the influence of the addition of an alloying element on the transformation of the iron oxyhydroxides and oxides from the GR in an aqueous solution, in order to understand a role of the element on the transformation of the corrosion products.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Copper Ions in Green Rust Suspension and Oxidation of Green Rust Containing Metallic Copper

et al. 2008

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Green rust (GR) consisting both of Fe(II) and Fe(III) was formed in an aqueous solution with a relatively low electrochemical potential. In order to understand both the reduction and oxidation reactions of copper in a GR suspension, the aqueous solution containing Green Rust 2(SO 4 2À ) (GR2(SO 4 2À )) was mixed with a copper sulfate solution and it was subsequently oxidized by passing a gas containing oxygen at room temperature. X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy were used for characterizing the reaction products. Copper ions were found to be reduced to metallic copper in the GR2(SO 4 2À ) suspension, while a part of GR2(SO 4 2À ) was oxidized to be transformed to -FeOOH. The pH and oxidation-reduction potential values of the aqueous solution were measured during the reactions. The importance of the reduction of Cu(II) to metallic copper occurred in the GR2(SO 4 2À ) suspension, and the oxidation processes of the suspension containing metallic copper was suggested as distinct reaction stages. These reaction stages are considered to be attributed to the different electrochemical potential of Cu(II)/Cu(0) and Fe(III)/Fe(II) in solution.

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

Cited by 45 publications

References 19 publications

Characteristic Behavior of Nickel Ions during Transformation of Green Rust to Ferric Oxyhydroxides in Aqueous Solution

Characteristic Behavior of Nickel Ions during Transformation of Green Rust to Ferric Oxyhydroxides in Aqueous Solution

Identification of Corrosion Products on Fe and Cu Metals using Spectroscopic Methods

Reduction of Copper Ions in Green Rust Suspension and Oxidation of Green Rust Containing Metallic Copper

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