Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization
Breakdown phenomena are investigated at continuous isothermal (20∘C) and galvanostatic (0.2–5 mA cm−2) anodizing of aluminum in ammonium salicylate in dimethylformamide (1 M AS/DMF) electrolyte. From the kinetic 𝑈𝑡(𝑡)-curves, the breakdown voltage (𝑈𝐵) values are estimated, as well as the frequency...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | International Journal of Electrochemistry |
| Online Access: | http://dx.doi.org/10.4061/2011/126726 |
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| author | Christian Girginov Stephan Kozhukharov |
| author_facet | Christian Girginov Stephan Kozhukharov |
| author_sort | Christian Girginov |
| collection | DOAJ |
| description | Breakdown phenomena are investigated at continuous isothermal (20∘C) and galvanostatic (0.2–5 mA cm−2) anodizing of aluminum in ammonium salicylate in dimethylformamide (1 M AS/DMF) electrolyte. From the kinetic 𝑈𝑡(𝑡)-curves, the breakdown voltage (𝑈𝐵) values are estimated, as well as the frequency and amplitude of oscillations of formation voltage (𝑈𝑓) at different current densities. The surface of the aluminum specimens was studied using atomic force microscopy (AFM). Data on topography and surface roughness parameters of the electrode after electric breakdowns are obtained as a function of anodization time. The electrode surface of anodic films, formed with different current densities until the same charge density has passed (2.5 C cm−2), was assessed. Results are discussed on the basis of perceptions of avalanche mechanism of the breakdown phenomena, due to the injection of electrons and their multiplication in the volume of the film. |
| format | Article |
| id | doaj-art-0a4bcd80844644019aca49dc3877561e |
| institution | Kabale University |
| issn | 2090-3537 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Electrochemistry |
| spelling | doaj-art-0a4bcd80844644019aca49dc3877561e2025-02-03T01:22:44ZengWileyInternational Journal of Electrochemistry2090-35372011-01-01201110.4061/2011/126726126726Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic AnodizationChristian Girginov0Stephan Kozhukharov1Department of Physical Chemistry, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski Boulevard, 1756 Sofia, BulgariaDepartment of Physical Chemistry, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski Boulevard, 1756 Sofia, BulgariaBreakdown phenomena are investigated at continuous isothermal (20∘C) and galvanostatic (0.2–5 mA cm−2) anodizing of aluminum in ammonium salicylate in dimethylformamide (1 M AS/DMF) electrolyte. From the kinetic 𝑈𝑡(𝑡)-curves, the breakdown voltage (𝑈𝐵) values are estimated, as well as the frequency and amplitude of oscillations of formation voltage (𝑈𝑓) at different current densities. The surface of the aluminum specimens was studied using atomic force microscopy (AFM). Data on topography and surface roughness parameters of the electrode after electric breakdowns are obtained as a function of anodization time. The electrode surface of anodic films, formed with different current densities until the same charge density has passed (2.5 C cm−2), was assessed. Results are discussed on the basis of perceptions of avalanche mechanism of the breakdown phenomena, due to the injection of electrons and their multiplication in the volume of the film.http://dx.doi.org/10.4061/2011/126726 |
| spellingShingle | Christian Girginov Stephan Kozhukharov Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization International Journal of Electrochemistry |
| title | Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization |
| title_full | Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization |
| title_fullStr | Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization |
| title_full_unstemmed | Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization |
| title_short | Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization |
| title_sort | surface of alumina films after prolonged breakdowns in galvanostatic anodization |
| url | http://dx.doi.org/10.4061/2011/126726 |
| work_keys_str_mv | AT christiangirginov surfaceofaluminafilmsafterprolongedbreakdownsingalvanostaticanodization AT stephankozhukharov surfaceofaluminafilmsafterprolongedbreakdownsingalvanostaticanodization |