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Evidence for the Growth Mechanism of Cr2 O 3 at Low Oxygen Potentials
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1983
Year
Pure CrEngineeringOxidation ResistanceOxygen IsotopeChemistryReactive Oxygen SpeciesParabolic Growth ConstantChemical EngineeringCorrosionGrowth RateRedox ChemistryMaterials EngineeringMaterials ScienceCrystalline DefectsCr2 O 3Metallurgical InteractionPhysical ChemistryDefect FormationGrowth MechanismElectrochemistryOxygen Reduction ReactionHigh Temperature MaterialsApplied PhysicsLow Oxygen PotentialsAlloy DesignAlloy Phase
The growth rate of on pure Cr, Ni‐25, and 50% Cr and Co‐25% Cr in flowing mixtures of effective oxygen pressures in the range at 1000°C has been measured. The parabolic growth constant is virtually independent of oxygen potential for both pure Cr and the alloys; for the alloys, it is about an order of magnitude smaller than for pure Cr. These results provide supportive evidence for Cr interstitials being the predominating mobile defect species in under these conditions.