Influences of Metal Chlorides and Sulfates on the Formation of Beta-FeOOH Particles by Aerial Oxidation of FeCl[sub 2] Solutions

Ishikawa, Tatsuo; Isa, R. M.; Kandori, Kazuhiko; Nakayama, Tsuneyoshi; Tsubota, Takayuki

doi:10.1149/1.1803837

Cited by 15 publications

(6 citation statements)

References 38 publications

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“…It is well known that inorganic anions like chloride, carbonate, or sulfate have a strong influence on final product characteristics. 36 This same influence has been also observed at the chemical oxidation of Fe 2+ to obtain iron oxide films. 37 In the present work, the above mentioned ferrous sulfate bath has been used.…”

Section: Resultssupporting

confidence: 57%

Surface Morphological Control of Nanostructured Single-Phase Fe₃O₄, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Bijani¹,

Ochoa-Martínez²,

Dalchiele³

et al. 2016

J. Electrochem. Soc.

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Nanostructured single-phase magnetite, goethite, and lepidocrocite thin films with variable surface morphology and degree of cristallinity were anodically electrodeposited in a potentiostatic mode onto titanium substrates under different deposition conditions. Dependence of phase composition, degree of cristallinity, preferred crystallographic orientation and surface morphology of these films on applied potential, electrodeposition electrolytic bath temperature and pH was conducted. X-ray diffraction analysis confirmed that the applied potential have a crucial effect on the phase composition of these films so that on degree crystallinity and prefererred crystallographic orientations. Scanning electron microscopy micrograph images indicated that electrolytic bath pH and temperature play an important role on the surface morphology and on the grain size of the deposited materials.Iron oxides and oxyhydroxides are abundant in nature and are the interest subject within the area of many applied sciences such as geochemistry, mineralogy, corrosion science, soil science, medicine, biology, metallurgy, and environmental protection. 1,2 In addition to the mentioned interest of iron oxides as a bulk material, the formation of thin films of these materials is being investigated for their remarkable properties from a scientific and technological point of view. 3,4 For instance, magnetite thin films have attracted great attention for spintronic applications, 5 hematite thin films have been extensively studied as photoelectrodes for solar driven water splitting 6-8 and there have been encouraging results reporting on the utilization of goethite and lepidrocrocite thin films as electrodes for rechargeable lithium-ion batteries and supercapacitors. 9 Moreover, it has recently been reported that goethite containing semiconductor materials enhance the photocatalityc activity efficiency of photocatalysts. 10 For these applications, iron oxide thin films have been obtained by different techniques: chemical vapor deposition (CVD), 11 sputtering, 12 plasma-enhanced chemical vapor deposition, 13 reactive sputter deposition, 14 dc reactive magnetron sputtering, 15 metallorganic chemical vapor deposition, 16 spray pyrolysis 17 and electrodeposition. 18,19 Among them, electrodeposition is presented as a soft-solution processing technique of thin-film preparation which enables to control the composition and morphology of deposited materials by the adjustment of the electrochemical parameters. 20-23 This ability to tune the shape of inorganic crystals is of extraordinary importance because their electronic structure, bonding, surface energy and chemical reactivities are directly related to their surface morphology. 24 In this work we are interested into the preparation of nanostructured thin films of magnetite (Fe 3 O 4 ), goethite (α-FeOOH) and lepidocrocite (γ-FeOOH) by electrochemical deposition. The anodic deposition from ferrous ions in aqueous solution was studied in the past in relation to the corrosion of iron. 25 Synthesis generally...

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Section: Resultssupporting

confidence: 57%

Surface Morphological Control of Nanostructured Single-Phase Fe₃O₄, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Bijani¹,

Ochoa-Martínez²,

Dalchiele³

et al. 2016

J. Electrochem. Soc.

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“…The most characteristic SAED pattern observed in the crystals with this morphology is shown in Figure 11 image along this projection, showing structural ordering along all the crystal, is presented in Figure 11 It must be pointed out that when synthesized in the laboratory, akaganeite usually presents a spindlelike morphology. [34][35][82][83] In contrast, on the basis of the results obtained in this study, the typical morphology of akaganeite formed in atmospheric conditions seems to be of a rod-like type.…”

Section: Corrosion-july 2015contrasting

confidence: 61%

Environmental Conditions for Akaganeite Formation in Marine Atmosphere Mild Steel Corrosion Products and Its Characterization

Morcillo¹,

González‐Calbet²,

Jiménez³

et al. 2015

Corrosion

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The corrosion of mild steel in chloride-rich atmospheres is a highly topical issue. The formation of the oxyhydroxide akaganeite (β-FeOOH) in this type of atmosphere leads to a notable acceleration of the steel corrosion process. The scientific literature contains many references to outdoor marine atmospheric tests, but so far has failed to clarify two basic matters in relation to akaganeite: the environmental conditions necessary for its formation, and its morphological characterization. Research has been performed at three atmospheric corrosion stations located at Cabo Vilano wind farm (Camariñas, Spain) at different distances from the shoreline (332, 590, and 2,400 m), with chloride deposition rates of 390, 74, and 29 mg/m2/day, respectively, with the exposure of mild steel specimens for 1 year. This paper reports the environmental conditions that generally led to the formation of akaganeite: an annual average relative humidity of around 80% or higher, and simultaneously, an annual average chloride deposition rate of approximately 60 mg/m2/day or higher. Rigorous characterization of akaganeite was performed by x-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy, and transmission electron microscopy/selected area electron diffraction.

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“…The pore structure of the rust layer is clearly related with steel corrosion because various molecules and ions such as O 2 , H 2 O, and Cl − diffuse through the rust layer in the corrosion process [ 146 , 163 ]. Despite this fact, few studies of rust pore structures have been reported.…”

Section: The Rust Layermentioning

confidence: 99%

Marine Atmospheric Corrosion of Carbon Steel: A Review

Alcántara¹,

Fuente²,

Chico³

et al. 2017

Materials

260

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The atmospheric corrosion of carbon steel is an extensive topic that has been studied over the years by many researchers. However, until relatively recently, surprisingly little attention has been paid to the action of marine chlorides. Corrosion in coastal regions is a particularly relevant issue due the latter’s great importance to human society. About half of the world’s population lives in coastal regions and the industrialisation of developing countries tends to concentrate production plants close to the sea. Until the start of the 21st century, research on the basic mechanisms of rust formation in Cl−-rich atmospheres was limited to just a small number of studies. However, in recent years, scientific understanding of marine atmospheric corrosion has advanced greatly, and in the authors’ opinion a sufficient body of knowledge has been built up in published scientific papers to warrant an up-to-date review of the current state-of-the-art and to assess what issues still need to be addressed. That is the purpose of the present review. After a preliminary section devoted to basic concepts on atmospheric corrosion, the marine atmosphere, and experimentation on marine atmospheric corrosion, the paper addresses key aspects such as the most significant corrosion products, the characteristics of the rust layers formed, and the mechanisms of steel corrosion in marine atmospheres. Special attention is then paid to important matters such as coastal-industrial atmospheres and long-term behaviour of carbon steel exposed to marine atmospheres. The work ends with a section dedicated to issues pending, noting a series of questions in relation with which greater research efforts would seem to be necessary.

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Influences of Metal Chlorides and Sulfates on the Formation of Beta-FeOOH Particles by Aerial Oxidation of FeCl[sub 2] Solutions

Cited by 15 publications

References 38 publications

Surface Morphological Control of Nanostructured Single-Phase Fe₃O₄, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Surface Morphological Control of Nanostructured Single-Phase Fe₃O₄, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Environmental Conditions for Akaganeite Formation in Marine Atmosphere Mild Steel Corrosion Products and Its Characterization

Marine Atmospheric Corrosion of Carbon Steel: A Review

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Influences of Metal Chlorides and Sulfates on the Formation of Beta-FeOOH Particles by Aerial Oxidation of FeCl[sub 2] Solutions

Cited by 15 publications

References 38 publications

Surface Morphological Control of Nanostructured Single-Phase Fe3O4, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Surface Morphological Control of Nanostructured Single-Phase Fe3O4, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Environmental Conditions for Akaganeite Formation in Marine Atmosphere Mild Steel Corrosion Products and Its Characterization

Marine Atmospheric Corrosion of Carbon Steel: A Review

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Product

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Surface Morphological Control of Nanostructured Single-Phase Fe₃O₄, α-FeOOH and γ-FeOOH Electrodeposited Thin Films

Surface Morphological Control of Nanostructured Single-Phase Fe₃O₄, α-FeOOH and γ-FeOOH Electrodeposited Thin Films