Abstract
In this study, one-step anodization was conducted on both mechanically polished and electropolished Al foils at different temperatures to examine their growth characteristics during prolonged anodization. Several unusual phenomena different from those reported previously were observed, especially for the preparation of ordered pore arrays on electropolished Al foils. First, under a constant voltage condition, a continuous increase of the oxidation current with fluctuation was observed in a prolonged period of anodization at high temperatures. Second, the ordered pore arrangement of the oxide initially obtained on the electropolished Al foil anodized at 25 °C was found to become disordered after being anodized for 72 h. Third, the total film thickness increased in the beginning and decreased in the prolonged period when the anodization was conducted at a high temperature. Thus, it is concluded that a highly ordered pore configuration with a large aspect ratio could only be obtained on the electropolished substrate by anodizing for a moderate period of time at low temperatures.
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