Characterization of corrosion products formed on steels in the first months of atmospheric exposure

Antunes, Renato Altobelli; Costa, Isolda; Faria, Dalva Lúcia Araújo de

doi:10.1590/s1516-14392003000300015

Cited by 159 publications

(94 citation statements)

References 15 publications

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“…5b), furthermore the acicular shape of the newly formed phase indicate secondary FeOOH formation. Similarly structured secondary FeOOH formation was described by Antunes et al (2003) and Castaño et al (2010) in corrosion products on steels. Since ankerite contains Fe as Fe 2+ , the formation of FeOOH requires oxidation of Fe.…”

Section: Resultssupporting

confidence: 62%

Characteristics of uranium uptake of Boda Claystone Formation as the candidate host rock of high level radioactive waste repository in Hungary

et al. 2014

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In Hungary two geological sites of the Boda Claystone Formation (BCF) located in the W-Mecsek Mountains (South Hungary) have been selected for the study of potential host rocks for high level radioactive waste (HLW), Gorica (G) Block and W-Mecsek Anticline (WMA) Block. The aim of the study was to obtain information on the uranium uptake characteristics of both sites. Our results revealed that in the sample, taken from WMA Block, where dolomites have ankerite rims and U-bearing rings, newly formed FeOOH precipitations were observed, which partly replaced the ankerite at near neutral pH (6.8). UO 2 2+ ions were adsorbed easily due to the enhanced specific surface area and high adsorption capacity of FeOOH formed from the dissolution of ankerite. The oxidation of Fe 2+ leads to the formation of FeOOH parallel to partial reduction of U 6+ to U 4+ . 75% of uranium was taken up by clay minerals and 25% by FeOOH although the ankerite concentration is as low as 6% in WMA Block of BCF. In G Block, the argillaceous matrix was found to be mainly responsible for the UO 2 2+ uptake. The study demonstrated that the U retention capacity of different BCF locations was significantly influenced by the mineralogy of these sites.

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Section: Resultssupporting

confidence: 62%

Characteristics of uranium uptake of Boda Claystone Formation as the candidate host rock of high level radioactive waste repository in Hungary

et al. 2014

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“…The morphology of the oxide layer formed on mild steels has been observed by a number of authors [25,31,[36][37][38][39][40][41][42] . The phases most frequently found present typical lepidocrocite, globular (cotton balls) (C) and fine whiskers (D) typical of goethite, and "cotton balls" (E) and cigar-shaped crystals (F) typical of akaganeite [37][38][39][40][41] .…”

Section: Morphologymentioning

confidence: 86%

“…Maghemite and hematite have also been found on steel surfaces exposed in different types of atmospheres [31] .…”

Section: Dependence On Environmental Conditionsmentioning

confidence: 99%

Atmospheric corrosion of mild steel

Morcillo¹,

Fuente²,

Díaz³

et al. 2011

REVMETAL

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The atmospheric corrosion of mild steel is an extensive topic that has been studied by many authors in different regions throughout the world. This compilation paper incorporates relevant publications on the subject, in particular about the nature of atmospheric corrosion products, mechanisms of atmospheric corrosion and kinetics of the atmospheric corrosion process, paying special attention to two matters upon which relatively less information has been published: a) the morphology of steel corrosion products and corrosion product layers; and b) long-term atmospheric corrosion (>10 years). KeywordsAtmospheric corrosion; Mild steel; Long-term; Morphology; Review. corrosión atmosférica del acero suave resumenLa corrosión atmosférica del acero suave es un tema de gran amplitud que ha sido tratado por muchos autores en numerosas regiones del mundo. Este artículo de compilación incorpora publicaciones relevantes sobre esta temática, en particular sobre la naturaleza de los productos de corrosión atmosférica, mecanismos y cinética de los procesos de corrosión atmosférica, prestando una atención especial a dos aspectos sobre los que la información publicada ha sido menos abundante: a) morfología de los productos de corrosión del acero y capas de productos de corrosión, y b) corrosión atmosférica a larga duración (> 10 años).

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“…SEM micrographs of the surface confirm the results of the Raman tests. As observed in Figure 3, sandy crystals of lepidocrocite [27,28] and cigar-like crystals of akaganeite can be observed on the surface.…”

Section: Belle Marementioning

confidence: 73%

Investigating atmospheric corrosion behavior of carbon steel in coastal regions of Mauritius using Raman Spectroscopy

et al. 2016

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Low carbon steel was exposed at two sites in Mauritius, namely Port Louis and Belle Mare. The site at Port Louis is basically an industrial marine one whereas the one at Belle Mare is a purely marine site. Though the corrosion loss trend at both sites follow the power law, the corrosion loss at Port Louis was found to be higher than that at Belle Mare. This study has been performed to investigate the surface characteristics of the rust layers of the samples exposed at the two sites, through Raman spectroscopy and SEM, so as to get a better insight into the mechanism of the atmospheric corrosion process. For Port Louis, it was observed that there was not much change in the corrosion products in the rust layer over the 3 years period. The structure was less compact than that at Belle Mare with the presence of lepidocrocite and akaganeite as commonly observed corrosion products. The corrosion rate at Port Louis is, therefore, expected to follow the same trend over the long term. For Belle Mare, the corrosion products changed significantly after 3 years of exposure. Though lepidocrocite and akaganeite were observed on the surface after 0.2 years of exposure, magnetite was the most probable corrosion product in the more compact rust layer after 3 years of exposure. This compactness of the rust layer is expected to have reduced the corrosion rate as compared to that of Port Louis. Significant changes in the corrosion rate at Belle Mare are, therefore, expected over the medium and the long term.

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Characterization of corrosion products formed on steels in the first months of atmospheric exposure

Cited by 159 publications

References 15 publications

Characteristics of uranium uptake of Boda Claystone Formation as the candidate host rock of high level radioactive waste repository in Hungary

Characteristics of uranium uptake of Boda Claystone Formation as the candidate host rock of high level radioactive waste repository in Hungary

Atmospheric corrosion of mild steel

Investigating atmospheric corrosion behavior of carbon steel in coastal regions of Mauritius using Raman Spectroscopy

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