Characterisation of Oxidised Surfaces
physically and chemically stable. An ideal oxide would not dissociate nor melt at the temperatures and pressures of interest;
mechanically stable. The scale would be capable of maintaining intimate contact with the surface of the metal, particularly when sudden temperature changes occur;
a barrier to diffusion. The function of a protective oxide is to separate the metal from the oxygen in the gas phase. The ideal oxide would, therefore, have a low diffusion rate for both oxygen and metal ions, otherwise the oxidation reaction would proceed at the oxide/metal or oxide/gas interfaces respectively;
continuous and dense. When pores or cracks are present in the oxide scale the protective capabilities of the oxide are lost.
KeywordsOxide Scale Protective Oxide Protective Capability Opposite Page Versus Edge
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