The transition from internal to external oxidation of Ni - X wt.% Cr at 950 degrees C
Résumé
The paper's focus is to establish the criterion for the transition from internal to external oxidation. This criterion is a simple value of oxide volume fraction where the coalescence of the nodular oxide in the continuous layer is considered as inevitable. It is obtained by the Wagner's analytical solution and by the data of Giggins et al. [1], which give the experimental transition from internal to external oxidation between 10 and 11 weight percent of chromium in the initial alloy. This paper also enables to obtain the oxygen diffusion coefficient in pure nickel thanks to the experimental results of oxidation at 950 degrees C during 10 hours on Ni-0.2Cr, Ni-1Cr and Ni-5Cr model alloys.
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