Abstract
The kinetics and products of oxidation of ternary Co-10Cr-5Al alloys in 1 atm of pure O2 at 700 and 800 oC were investigated. Oxidation of the alloys approximately obeyed the parabolic rate law. The scale formed at 700 oC was composed of an outer CoO layer and an inner complex layer rich in Al2O3 and Cr2O3 which were intermingled with spinel Co(Cr, Al)2O4. There was no internal oxidation zone beneath the scale. However, as shown by Fig. 3. b, internal oxidation zone of Al or even Cr was obviously present beneath the scale formed at 800 oC, though the scale was of a similar microstructure with that at 700 oC.
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