Abstract
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.
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