Abstract
The corrosion behaviour of Inconel 600 has been studied at 700°C during exposures for various times to oxygen and HCl-containing gas mixtures. The specimens were examined using XPS depth profiles for quantitative analysis of the developing surface layers. From the overall composition, as well as from the distribution of the elements chromium, iron, nickel, oxygen and chlorine inside the corrosion layer, the mechanistic aspects of chloride attack are discussed and a model to account for the observations has been developed. The experiments give evidence that Inconel 600 undergoes processes which are described in the literature as activated oxidation. Furthermore, chlorine enrichment at the corrosion layer/bulk-boundary has been observed, while no chlorine was detected inside the corrosion layer, unless serious degradation of the surface layer had already occurred.
Published Version
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