Kinetic Study of the Low Temperature Internal Oxidation of Nickel Based Model Alloys Exposed to PWR Primary Water

Benoît Ter-Ovanessian; Julien Deleume; Jean Marc Cloué; Eric Andrieu

doi:10.4028/www.scientific.net/MSF.595-598.449

Paper Titles

Altering Corrosion Response via Grain Boundary Engineering
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Modelling of Corrosion Induced Stresses during Zircaloy-4 Oxidation in Air
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Thermodynamic Modelling of the Destruction of the Surface Cr₂O₃ on Alloy 230 in the Impure Helium Atmosphere of a Gas Cooled Reactor
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Comparison of the High Temperature Surface Reactivity in Impure Helium of Two Materials for Gas Cooled Reactors
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Kinetic Study of the Low Temperature Internal Oxidation of Nickel Based Model Alloys Exposed to PWR Primary Water
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Chemical Evolution in the Substrate due to Oxidation: A Numerical Model with Explicit Treatment of Vacancy Fluxes
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Corrosion of T91 Steel in LBE: Contribution to the Study of the Pb–Bi–O–Fe–Hg System - Thermodynamic Description of PbO–Fe₂O₃
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Electrochemical Study of the Corrosion of Metals in Molten Fluorides
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Influence of Al on the High Temperature Corrosion Behaviour of Inconel 617 in VHTR Primary Coolant Atmosphere
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Kinetic Study of the Low Temperature Internal Oxidation of Nickel Based Model Alloys Exposed to PWR Primary Water

Abstract:

Two Ni-Fe-Cr ternary alloys have been oxidized in simulated pressurized water reactor primary water at 360°C for 1000 h. The chemical composition of those alloys were chosen in order to be representative of the one of chromium depleted areas under the oxide scale of industrial alloys (e.g. alloy 600) exposed in the same conditions. The resulting oxidized structures (corrosion scale and underlying metal) were characterized using complementary analytical methods (FEG-SEM, TEM, SIMS, optical microscopy). On the one hand, the characterized external oxide layer is very close to the one observed on industrial nickel-base alloys, hence validating the use of such model alloys. On the other hand, both free oxygen and oxides have been detected at grain boundaries several micrometers under the metal/oxide interface. Implications of such a finding on the involved transport mechanisms for oxygen and the intergranular stress corrosion cracking resistance of nickel-base alloys are then discussed.