Structural Characterization of Corrosion in Sae 1020 Steel Exposed to Urban, Industrial and Rural Environments

Abstract

In this study SAE 1020 steel plates were exposed to different atmospheric environments -a rural zone, an industrial area and an urban neighborhood of the same city in the south of Brazil. After exposure intervals of 60 and 120 days, samples were collected in the form of dust from the plates' surface. The products originated from steel corrosion were analyzed by X-ray diffraction and Mössbauer spectroscopy. Differences were observed in the evolution of corrosion for each environment where the samples were exposed. According to the Hiller model, the rural zone was the more aggressive environment.Keywords: Steel. Mössbauer spectroscopy. X-ray diffraction. Atmospheric corrosion. RESUMONeste trabalho, placas de aço SAE 1020 foram expostas à diferentes ambientes atmosféricos -na zona rural, em área industrial e na região urbana da mesma cidade, no estado do Paraná, sul do Brasil. Amostras do produto de corrosão superficial dos aços foram coletadas após 60 e 120 dias de exposição. Foram feitas analises através de difratometria de raios-X e Espectroscopia Mössbauer. Foram observadas diferenças na evolução da corrosão das amostras expostas aos diferentes ambientes. De acordo com esquema de Hiller, a zona rural apresentou um ambiente mais agressivo aos aços. Palavras-chave:Aços. Espectroscopia Mössbauer. Difração de raios-X. Corrosão atmosférica.