Abstract
AbstractSpecimens of Fe–9Cr steel were oxidised sequentially, at 4·1 MPa pressure, in natural carbon dioxide and then in carbon dioxide enriched in 18O. The specimens were cross-sectioned and the distribution of the 18O was determined using imaging secondary ion mass spectroscopy (SIMS). Scales developed at the oxide/gas interface, at the oxide/metal interface, and within the oxide layer. When internal oxidation occurred, growth took place at the interface between the internally oxidised zone and the metal. It is shown that imaging SIMS, when used in conjunction with 18O as a tracer, is a powerful technique for studying oxide growth mechanisms.MST/969
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