The composition of the exposed weathering steel is presented in Table 1. The chemical composition of alloying elements was confirmed by inductively coupled plasma optical emission spectroscopy (ICP-OES). The specimen dimensions are 100 mm © 50 mm © 3 mm. The specimens were abraded with 800 # SiC paper, rinsed with water and acetone, dried, weighed and kept in a moisture free desiccators for 3 days prior to exposure. ASTM G 50-9715) standard was followed and the specimens were exposed to environment for 36 months (January 2009-Dec 2012). The exposure distance was 100 m from the marine and 200 m from the industrial environment.
Analysis of corrosion products formed on weathering steel surfaces exposed for 3 years in the industrial-marine-urban environment led to better understanding of corrosion process leading to the formation of adherent protective layer on the skyward surface when compared to earthward surface. The results obtained from ATR-FTIR and XRD confirmed the formation of two distinct types of layers each having unique oxides and oxyhydroxides on their surfaces. The formation of goethite in the inner layer (SIL) as stable form of product with needle like structures was influenced by SO2, which led to the formation of protective skyward rust layers along with other iron oxides. The BET isotherm studies confirmed the compactness and densified nature of skyward inner rust layers which prevents the ingress of chloride ions. Corrosion process with enrichment of Ni and Cr resulted in fine rust particles in the skyward inner layer with higher surface area, thereby ensuring the corrosion protection of weathering steel.
Practice for conducting atmospheric corrosion of corten
Carbon Steel, Corten Steel, Stainless steel
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