Characteristics of the Rust from Weathering Steels in Louisiana Bridge Spans

Raman, A.; Razvan, A.; Kuban, B.; Clement, K. A.; Graves, W.E.

doi:10.5006/1.3583050

Cited by 47 publications

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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] . [37][38][39][40][41] .…”

Section: Morphologymentioning

confidence: 99%

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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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Section: Morphologymentioning

confidence: 99%

“…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] . [37][38][39][40][41] . structures ( Fig.…”

Section: Morphologymentioning

confidence: 99%

Atmospheric corrosion of mild steel

Morcillo¹,

Fuente²,

Díaz³

et al. 2011

REVMETAL

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“…The morphology of the oxide layer formed on carbon and weathering steels has been observed by several authors [10][11][12][13][14] . The phases more frequently found (lepidocrocite, goethite and magnetite) present typical structures.…”

Section: Introductionmentioning

confidence: 98%

“…Many authors [2][3][4][5][6][7][8][9] have studied the corrosion products formed on carbon and weathering steels exposed to various atmospheres by X-ray diffraction and Raman microscopy. The main phases reported are lepidocrocite (γ-FeOOH), goethite (α-FeOOH) and magnetite (Fe 3 O 4 ).…”

Section: Introductionmentioning

confidence: 99%

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

Antunes

Costa

Faria³

2003

Mat. Res.

169

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The corrosion products of carbon steel and weathering steel exposed to three different types of atmospheres, at times ranging from one to three months, have been identified. The steels were exposed in an industrial site, an urban site (São Paulo City, Brazil), and a humid site. The effect of the steel type on the corrosion products formed in the early stages of atmospheric corrosion has been evaluated. The corrosion products formed at the various exposure locations were characterized by Raman microscopy, X-Ray diffraction (XRD) and their morphology was observed by Scanning Electron Microscopy (SEM). Three regions of different colours (yellow, black and red) have been identified over the steel coupons by Raman microscopy. Analysis carried out on each of these areas led to the characterization of the correspondent oxide/hydroxide phases. The main phases present were lepidocrocite (γ-FeOOH) and goethite (α-FeOOH). Small amounts of magnetite (Fe 3 O 4 ) were also eventually encountered.

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“…The ac tual min er al og i cal com po si tion can dif fer from those of pri mary pre cip i tates. For ex am ple, the goethite for ma tion is most prob a bly re lated to the pro cess of dis so lu tion and reprecipitation of ear lier cor ro sion prod ucts, lepidocrocite most likely (Raman et al, 1986). These iron oxides might be re spon si ble for spe cific colours of both the cor rosion prod ucts and speleothem sur faces, e.g.…”

Section: Discussionmentioning

confidence: 99%

Colourful speleothems in the Wieliczka Salt Mine

Sawłowicz

Przybyło

Boroń

2014

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Sec ond ary ha lite de pos its in the Wieliczka Salt Mine are rep re sented by var i ous forms of speleothems. Some of them, e.g. sta lac tites, cau li flow ers or crusts, re veal var i ous hues, yel low to red to brown. These hues are re lated to iron com pounds, but the forms, oc cur rence and com po si tion of these com pounds has not pre vi ously been stud ied. To ex plain the or i gin of their colours a de tailed study of sam ples col lected in the mine, in clud ing brines and wa ter sol u ble ex tracts and pro duced ex per imen tally in the lab o ra tory, has been un der taken us ing SEM, XRD and AAS. The colour ful speleothems are com pared, us ing SEM-EDS, with the forms and com po si tion of rust ing metal artefacts, where sev eral iron ox ide min er als have been iden ti fied. We sug gest that col oured ha lite is gen er ally pure ha lite of which the sur face was cov ered by a fer ric min er als sus pen sion in the brine. Colours of the speleothems stem from the var i ous colours of iron min er als whereas their in ten sity is re lated prob ably to the type of fluid that coated the crys tals, a con tin u ous film or finely dis persed mi cron-size min eral ag gre gates.

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Characteristics of the Rust from Weathering Steels in Louisiana Bridge Spans

Cited by 47 publications

References 0 publications

Atmospheric corrosion of mild steel

Atmospheric corrosion of mild steel

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

Colourful speleothems in the Wieliczka Salt Mine

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