There are many environments in, for instance, power generation processes where components experience mechanical wear superimposed on conditions of aqueous or high-temperature corrosion. Current understanding of the factors considered to determine the response of a material to such conditions involves a large number of independent variables, so that it is not surprising that our ability to select materials for improved performance remains fairly rudimentary. In this paper, an overview is presented of the influence of the major variables used to describe the erosion-corrosion potential of an environment as well as the resistance of a material, and the effectiveness of available predictive approaches based on these is critically examined. The intent of this overview is to highlight areas where the current state of understanding provides a reasonable basis on which future research might be based, and areas where better characterization is needed before phenomenological observations can be described in a mechanistically-
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