The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The formation of protective Cr2O3 layer on Ni-Cr alloys depends on (i) the chromium concentration at the alloy/oxide interface and (ii) the chromium diffusion in the alloy from the core towards the surface. A sufficient interfacial chromium content and chromium gradient are necessary to sustain the selective external oxidation of chromium. Ni-30Cr samples have been oxidised at 1150°C in 10−13 up to 10−3atm O2. Analytical methods are used to model the diffusion in steady-state conditions and to predict the lifetime of the alloy. The interdiffusion coefficient is found equal to 1.2×10−10cm2s−1.
IJL-UMR 7198, Départment CP2S, Equipe 206 (Surface et Interface: Réactivité Chimique des Matériaux), B.P. 70239–F-54506 Vandœuvre les Nancy Cedex, France
AREVA NC, Tour Areva, 1 Place Jean Millier, F-92084, Paris-La-Défense Cedex, France
IJL-UMR 7198, Départment CP2S, Equipe 206 (Surface et Interface: Réactivité Chimique des Matériaux), B.P. 70239–F-54506 Vandœuvre les Nancy Cedex, France
CEA, Université Paris-Saclay, Den-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), F-91191, Gif-sur-Yvette, France
IJL-UMR 7198, Départment CP2S, Equipe 206 (Surface et Interface: Réactivité Chimique des Matériaux), B.P. 70239–F-54506 Vandœuvre les Nancy Cedex, France