Surface Charge at the Oxide/Electrolyte Interface: Toward Optimization of Electrolyte Composition for Treatment of Aluminum and Magnesium by Plasma Electrolytic Oxidation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Langmuir Année : 2016

Surface Charge at the Oxide/Electrolyte Interface: Toward Optimization of Electrolyte Composition for Treatment of Aluminum and Magnesium by Plasma Electrolytic Oxidation

Résumé

Controlling microdischarges in plasma electro-lytic oxidation is of great importance in order to optimize coating quality. The present study highlights the relationship between the polarity at which breakdown occurs and the electrolyte pH as compared with the isoelectric point (IEP). It is found that working at a pH higher than the IEP of the grown oxide prevents the buildup of detrimental cathodic discharges. The addition of phosphates results in a shift in the IEP to a lower value and therefore promotes anodic discharges at the expense of cathodic ones.

Domaines

Matériaux Plasmas
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Dates et versions

hal-02113597 , version 1 (06-02-2023)

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Alexandre Nominé, Julien Martin, Cédric Noel, Gérard Henrion, Thierry Belmonte, et al.. Surface Charge at the Oxide/Electrolyte Interface: Toward Optimization of Electrolyte Composition for Treatment of Aluminum and Magnesium by Plasma Electrolytic Oxidation. Langmuir, 2016, 32 (5), pp.1405-1409. ⟨10.1021/acs.langmuir.5b03873⟩. ⟨hal-02113597⟩
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