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

Materials Research

Renato Altobelli Antunes²  Isolda Costa²  Dalva Lúcia Araújo De Faria¹ 

[1] ,IPENSão Paulo SP ,Brasil

关键词: corrosion products;    Raman microscopy;    x-ray diffraction;   

DOI  :  10.1590/S1516-14392003000300015

来源: SciELO

【 摘 要 】

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 (g-FeOOH) and goethite (a-FeOOH). Small amounts of magnetite (Fe3O4) were also eventually encountered.

【 授权许可】

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