| Autor: |
Tomo Hariyama, Kazunobu Ito, Teruyoshi Saito, Sumitaka Watanabe, Sachiko Ono |
| Předmět: |
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| Zdroj: |
Materials Transactions; 2024, Vol. 65 Issue 8, p954-960, 7p |
| Abstrakt: |
In this study, we examined a method for whitening an aluminum surface by anodizing it in a sulfuric acid solution to industrialize the process. Anodic oxidation in a sulfuric acid solution at 2.5Adm-2 for 120 s resulted in the whitening of the aluminum surface, but localized burning occurred. When anodization was performed at a low current density for a short time (2.5Adm-2 for 4.5 s) after a high current density, a white anodic film was successfully obtained without burning. Cross-sectional scanning electron microscopy (SEM) observation of the white film revealed that etching by pretreatment created an uneven surface, and pore branching created an uneven metal-oxide interface. The fluctuating value of the film thickness obtained by length measurements using SEM was 0.2-0.3 µm. This value is sufficient to whiten the anodic film because of increase in diffusion reflection at the film surface and the metal-oxide interface. These results indicate that the difference in the peak voltage between the first and second anodizing resulted in the formation of a branched pore structure and film whitening. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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