ABSTRACT
The oxide scale grown on the 20Cr/25Ni/Nb stainless steel during four oxidation cycles in a carbon dioxide based environment at 875°C, with intermediate furnace cooling to room temperature, has been examined by sequential scanning electron microscopy (SSEM). This enabled investigation of the nature of failure of the initial, uniform, protective chromium rich oxide scale, the re-oxidation of the steel areas exposed involving the formation of iron-rich pitting type scale and also of the spallation of this oxide during subsequent oxidation/cooling cycles.
