Moving Boundary Simulation of Iron-Zinc Sacrificial Corrosion under Dynamic Electrolyte Thickness Based on Real-Time Monitoring Data
| Autor: | Daniel John Blackwood, Herman Terryn, Sudesh Wijesinghe, Nils Van den Steen, Mohsen Saeedikhani, Sareh Vafakhah |
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| Přispěvatelé: | Faculty of Engineering, Materials and Chemistry, Materials and Surface Science & Engineering, Electrochemical and Surface Engineering |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment 020209 energy Condensation Evaporation chemistry.chemical_element 02 engineering and technology Zinc Electrolyte engineering.material Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Corrosion Galvanic corrosion chemistry Coating 0202 electrical engineering electronic engineering information engineering Materials Chemistry Electrochemistry engineering Relative humidity Composite material |
| Zdroj: | Journal of The Electrochemical Society. 167:041503 |
| ISSN: | 1945-7111 |
| DOI: | 10.1149/1945-7111/ab7368 |
| Popis: | The electrolyte film thickness condensation and evaporation is an important parameter for complexity of atmospheric corrosion. Atmospheric corrosion rate of zinc at the west coast of Singapore was measured for one year using an electrical resistance monitoring system. The analysis of the data reveals that significant corrosion rates only occur at specific hours on dry days. The beginning of this period corresponds to falling temperature and rising relative humidity resulting in the formation of a film of moisture on the zinc surface and the end corresponds to a point that this film dries as the temperature increases. This finding allowed the drying rate of the moisture film to be estimated for input into a moving boundary simulation model of the galvanic corrosion in scratched and zinc coating samples. The simulation results showed that the maximum corrosion rate occurs at electrolyte thickness of about 8 μm. Moreover, the simulation suggested that cut-edge is a more harmful defect than scratch, which was confirmed by the appearance of iron corrosion products on atmospheric exposed cut-edge samples whereas scratched samples were not corroded after one week of exposure. Finally, moving boundary simulation allowed to predict the changes to the geometry of the corroding electrodes. |
| Databáze: | OpenAIRE |
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