抄録
Anodized films on aluminum formed in sodium hydroxide bath containing hydrogen peroxide were investigated by X-Ray photoelectron spectroscopy (ESCA) and X-Ray diffraction. Electron binding energies between Al and O in anodized films formed at various electrolytic conditions were measured by ESCA. Metallic aluminum and aluminum (III) were observed in the films which anodized for 3 seconds but aluminum (III) were only observed after anodized for additional few seconds in the same anodizing bath at 40 voltage. By this results, it was suggested that anodized films were formed about 30Å by anodizing for 7 seconds. It was observed that amount of oxygen atoms due to hydroxide in the films for 3 seconds anodizing were increased and that of oxide were also increased by 7 seconds anodizing. X-ray diffraction patterns showed that a transition to αAl2O3 occured at about 900°C by heating and its temperature was lower than that of sulfuric acid anodized films. Hydrates of the films were obtained at lower temperature than sulfuric acid anodized films by the hydrothermal treatment.
