Abstract
The structure of atmospheric corrosion product of Fe–5 mass%Cr alloy film has been examined by using synchrotron radiation X-rays and γ-rays for Mössbauer spectroscopy. The relationship between the position of Cr 3+ in the atomic arrangement of the rust crystal and the protective performance of the rust layer is discussed. It was found that the rust layer of the Fe–Cr alloy film contains a large amount of ultrafine Cr–goethite. By analyzing the X-ray absorption fine structure at Cr K-edge of the rust layer, we can conclude that Cr 3+ is positioned in the double chains of vacant sites in the network of FeO 3(OH) 3 octahedra in the goethite crystal. This Cr 3+ site might explain the protective performance, owing to dense aggregation of fine crystals with cation selectivity, of the Cr–goethite.
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