Abstract
Aluminum has excellent workability and surface finishing, but it corrodes easily and has low hardness. In this study, a high corrosion resistance oxide film was prepared first by hydrothermal treatment on aluminum in the primary treatment. Subsequently, nano MnO2 particles were immobilized on minute high corrosion resistance oxide film by hydrothermal treatment. Specifically aluminum was maintained for 30 minutes under 483 K (2.0 MPa) conditions in a 0.04 mol/l aluminum nitrate aqueous solution by hydrothermal treatment. Then, MnO2 was immobilized by hydrothermal treatment for 30 minutes under 453-483 K (1.0-2.0 MPa) conditions in a potassium permanganate aqueous solution on the boehmite film. A thick boehmite film (20 μm) was prepared by adding aluminum nitrate formed globules in the primary treatment, and it possessed wide surface area. Nano MnO2 particles (30 nm) were immobilized onto the boehmite film in a potassium permanganate aqueous solution by hydrothermal treatment in the secondary treatment. In this manner a MnO2-boehmite composite film with wide surface area and high oxidation activity was prepared successfully and for the first time.
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