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Phase-field model of oxidation: Equilibrium
Phys. Rev. E 95, 032801 – Published 2 March, 2017
DOI: https://doi.org/10.1103/PhysRevE.95.032801
Abstract
A phase-field model of an oxide relevant to corrosion resistant alloys for film thicknesses below the Debye length , where charge neutrality in the oxide does not occur, is formulated. The phase-field model is validated in the Wagner limit using a sharp interface Gouy-Chapman model for the electrostatic double layer. The phase-field simulations show that equilibrium oxide films below the Wagner limit are charged throughout due to their inability to electrostatically screen charge over the length of the film, . The character of the defect and charge distribution profiles in the oxide vary depending on whether reduced oxygen adatoms are present on the gas-oxide interface. The Fermi level in the oxide increases for thinner films, approaching the Fermi level of the metal in the limit , which increases the driving force for adsorbed oxygen reduction at the gas-oxide interface.
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