THE STUDY OF ELECTROLYTIC COLORING AFTER THE SECOND ANODIC TREATMENT OF ALUMINUM SHEET
| Autor: | Sung-Lin Tsai, 蔡松霖 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 This study was carried out by means of the method of twice anodic treatment in the sulfuric acid and then electrolytic coloring in cupric sulfate solution. The effects of the first and second anodic treatment on the properties of the anodic films and colored films would be discussed. For the second anodic treatment, the film thickness of the anodic film is thicker than that from the first anodic treatment. But the hardness is lower than that from the first anodic treatment. Whether the first or second anodic treatment is done or not, the film thickness of the anodic films is almost not changed after the electrolytic coloring, however, the hardness decreases with the coloring times. As for the color difference of colored film, the L value from the second anodic treatment is lower than the first anodic treatment. Under the coloring voltage of 20 V, the L value of colored film from the second anodic treatment is approximately 10 and the a and b values approach to zero and hence the darkest shade of black color can be reached. From the film dissolution test and SEM, the anodic film from the second anodic treatment has the more porous and looser structure, it is suitable for coloring. From the observation of AFM, the anodic film surface from the second anodic treatment is even and the pores are enlarged. At the range of the visible light wavelength, the reflectivities of colored film from the second anodic treatment are all lower than those from the first treatment. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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