Abstract
The behaviour of oxide scales grown on high-temperature alloys and their action as diffusion barriers against hydrogen and tritium permeation is described. Static and dynamic permeation measurements, as well as acoustic emission measurements, indicate that chromium oxide scales are superior to scales containing spinel structure of the type Cr 2 MeO 4 ( Me = Ni, Fe, Co), whereas spinel structures of the type Cr 2 MeO 4 ( Me = Mn, Ti) do not seem to have a negative influence on the barrier action of the scale. The role of oxygen potential with respect to scale composition, mechanical stability and scale growth is described. Hydrogen permeation measurements are very sensitive and are thus able to detect changes in the scale structure. Dynamic measurements combined with static measurements enable us to obtain relevant data on the scale — like diffusivity and solubility of hydrogen in scales.
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