The steam oxidation mechanism of heat resistant alloys and efficiency improvement of energy conversion processes at high temperature

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This study was planned to clarify the mechanism of steam oxidation of heat resistant alloys in energy conversion process at elevated temperatures. The effect of water vapor on high temperature oxidation is proposed based on the obtained results. The dissociated hydrogen from water vapor goes into alloys and adsorbed at the internal oxide/alloy interface, result in the enhancement of oxygen transport along the interface. Protective layer hardly forms in humid atmosphere, because internal oxidation is enhanced by the presence of water vapor. On the other hand, the comparison of the product of hydrogen permeability and thickness in both the oxide scales and metals provides the information that the effect of hydrogen permeation on oxidation behavior strongly depends on the practical operation of the power plants.