Journal
CORROSION SCIENCE
Volume 45, Issue 2, Pages 381-394Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0010-938X(02)00093-8
Keywords
atmospheric corrosion; rust layer; Fe-Cr alloy; synchrotron radiation; Mossbauer spectroscopy; XAFS
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The structure of atmospheric corrosion product of Fe-5 mass%Cr alloy film has been examined by using synchrotron radiation X-rays and gamma-rays for Mossbauer spectroscopy. The relationship between the position of Cr3+ 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 FeCr alloy film contains a large amount of ultraftne Cr-goethite. By analyzing the X-ray absorption fine structure at Cr K-edge of the rust layer, we can conclude that Cr3+ is positioned in the double chains of vacant sites in the network of FeO3(OH)(3) octahedra in the goethite crystal. This Cr3+ site might explain the protective performance, owing to dense aggregation of fine crystals with cation selectivity, of the Cr-goethite. (C) 2002 Elsevier Science Ltd. All rights reserved.
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