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Many structural materials rely on the formation of chromia, silica, or alumina as a protective layer when exposed in high temperature oxidizing environments. The presence of these oxide layers provides a protective diffusion barrier which slows down further oxidation. In atmospheres containing water vapor, however, reactions to form volatile hydroxide species occur which remove the surface oxide, thus, lowering the protective capability of the oxide scale. This paper summarizes the current understanding of volatility of chromia, silica, and alumina in water vapor-containing combustion environments. In addition unanswered questions in each system are discussed. These systems were reviewed in a previous publication [1]. The current paper represents an update on the considerable information learned in the past five years for these systems. Volatility is defined here as material loss due to the formation of vapor species. Volatility of oxides in environments containing water vapor occurs by the following generalized reaction:

Volatility of Common Protective Oxides in High-Temperature Water Vapor: Current Understanding and Unanswered Questions