The mechanism of evolution of microdischarges at the beginning of the PEO process on aluminum
| Autor: | Miljenko Perić, Mirjana Sarvan, Marija Petković-Benazzouz, B. Kasalica, I. Belca, Jelena Radić-Perić |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Scanning electron microscope Analytical chemistry Energy-dispersive X-ray spectroscopy Oxide chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences chemistry.chemical_compound Coating Aluminium Materials Chemistry Composite material Dielectric strength Anodizing Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry engineering 0210 nano-technology Layer (electronics) |
| Zdroj: | Surface and Coatings Technology. 298:24-32 |
| ISSN: | 0257-8972 |
| Popis: | In this study, we present the results of investigation of plasma electrolytic anodization of aluminum by means of different experimental techniques, in few first minutes of the process. Scanning electron microscopy equipped with X-ray energy dispersive spectroscopy was used to study the aluminum oxide coating morphology, microstructure and composition as well as cross-sections of the obtained coating. The mechanism of evolution of microdischarges at the beginning of the plasma electrolytic anodization process is proposed. Our results indicate that during a single discharge event, new inner oxide layer is formed at the bottom of discharge channel, between the metal substrate and the Al 2 O 3 layer. That new oxide layer and the gas that remains in the channel seem to present a higher barrier for dielectric breakdown then the original coating layer. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect