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Oxidation of iron at 400-600 °C in dry and wet O2
Authors:Bagas Pujilaksono  Torbjörn Jonsson  Jan-Erik Svensson
Affiliation:a High Temperature Corrosion Centre, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
b Microscopy and Microanalysis Group, Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
Abstract:The oxidation of iron in dry and wet O2 at 400-600 °C has been re-investigated using gravimetry, SEM/EDX, XRD and FIB. In the presence of O2, water vapour accelerates iron oxidation at 500 and 600 °C. At 400 and 500 °C the magnetite layer is duplex and exposure to water vapour results in the formation of blades on top of a fine-grained hematite layer. At 600 °C it results in a surface without needles and blades. The increased oxidation rate at 500 and 600 °C is attributed to a smaller grain size in the hematite layer resulting in faster ion transport.
Keywords:A  Oxidation kinetics of iron  C  Water vapour  C  Textured growth hematite  C  Void distribution
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