An approach is proposed for describing the rate of loss from a metal surface subjected to the simultaneous action of high-temperature oxidation and mechanical erosion, in terms that involve the major parameters that determine the oxidation behavior of the alloy and the “erosion potential” of the environment. Different regimes are identified where oxidation or erosion is dominant, and where the two processes act together. It is shown that under conditions where exfoliation of the oxide scale (or of an adherent deposit) can occur, surface loss by erosion-oxidation is a strong function of the metal temperature and the erodent flux. Some simplifying assumptions are made to provide a workable framework for incorporating the parameters in a way that is consistent with the observed modes of material loss. The effects of erodent impacts on scale spallation are statistical in nature, and an initial attempt to address this issue is illustrated.
Keywords
Erosion-oxidation; Modeling; I-Iigh-temperature oxidation; Erosion; Scale exfoliation