Localized corrosion (pitting): A model of passivity breakdown including the role of the oxide layer nanostructure |
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Authors: | P Marcus V Maurice |
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Affiliation: | a Laboratoire de Physico-Chimie des Surfaces, CNRS (UMR 7045) - Université Pierre et Marie Curie, Ecole Nationale Supérieure de Chimie de Paris, 11 rue Pierre et Marie Curie, F-75231 Paris Cedex 05, France b Institut für Physikalische Chemie und Elektrochemie, Heinrich-Heine-Universistät, Universitätsstr. 1, D-40225 Düsseldorf, Germany |
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Abstract: | A model of passivity breakdown including the role of the inter-granular boundaries of the barrier oxide layer on the redistribution of the potential at the metal/oxide/electrolyte interfaces in the passive state is presented. Different mechanisms of breakdown at the oxide grain boundaries are considered, depending on which interface governs the potential drop: (i) local thinning and dissolution of the oxide layer, (ii) metal voiding or (iii) particle growth at the metal/oxide interface followed by rupture of the barrier layer. The role of chloride ions is discussed in each case. The key experimental observations made at the nanometre scale and validating the model are discussed. |
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Keywords: | C Passive films Passivity breakdown C Repassivation Localized corrosion Oxide inter-granular boundaries |
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