Geometry influence on corrosion in dynamic thin film electrolytes
| Autor: | Herman Terryn, Nils Van den Steen, Johan Deconinck, Hans Simillion |
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| Přispěvatelé: | Electrical Engineering and Power Electronics, Chemical Engineering and Industrial Chemistry, Materials and Chemistry, Faculty of Engineering, Electrochemical and Surface Engineering, Materials and Surface Science & Engineering |
| Rok vydání: | 2016 |
| Předmět: |
FEM
Materials science MITReM 020209 energy General Chemical Engineering Inorganic chemistry Modeling Thin electrolyte films 02 engineering and technology Electrolyte Electrochemistry Chloride Corrosion Concentrated solutions Atmospheric corrosion 0202 electrical engineering electronic engineering information engineering medicine Current (fluid) Thin film Composite material Current density medicine.drug |
| Zdroj: | Electrochimica Acta. 209:149-158 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2016.04.072 |
| Popis: | Atmospheric corrosion is a complex problem, essentially an electrochemical process under confined thin electrolyte layers. Predictions require better mechanistic models to understand the underlying fundamental subprocesses on a microscopic level. We developed a mechanistic multi-ion transport and reaction model (MITReM) that considers time-dependent accumulation of concentrations in thin (NaCl) confined electrolyte layers. The model predicts local concentration and electrolyte potential distributions, from which corrosion rates are derived. Simulations in the confined dynamic film show that the chloride accumulation causes a deviation from the reverse proportionality of the corrosion current with the film thickness below films of 10 μm . The oxygen distribution and local corrosion current densities demonstrate that the contribution of the edge effect decreases for thinner electrolyte layers. The influence of the electrode geometry on the current density also decreases with decreasing film thickness. These qualitative insights are essential for the development of atmospheric corrosion prediction tools and aid in the design and interpretation of electrochemical techniques for confined thin film electrolytes. |
| Databáze: | OpenAIRE |
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