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To investigate the application of anodization technology on improving the interface performance between epoxy resin and aluminum electrodes, aluminum alloys were electrolyzed for different durations to form anodized films on the substrate surface. The morphology, composition, structure, and electrical properties of the anodized films were characterized, and the effects of anodic oxide films on the adhesion and dielectric properties of the epoxy-aluminum interface were analyzed. The results show that after anodic oxidation, an amorphous anodized film with a nanoporous structure is formed. As the electrolysis time increases, the thickness of the anodized film increases linearly, while the internal defects also increase, which reduces the volume resistivity and electric strength. The film exhibits a high dielectric constant and dielectric loss factor, which remain stable at 25℃-125℃. Benefiting from the nanoporous structure and polar bonds, the adhesive shear strength between the aluminum substrate and epoxy resin increases from 6.76 MPa to 10.89 MPa, and the adhesive tensile strength increases from 6.89 MPa to 9.78 MPa after anodic oxidation. The impact toughness increases from 66.21 kJ/m2 to 76.42 kJ/m2, and the flexural strength increases from 147.65 MPa to 180.50 MPa. The anodized film improves the electric strength of the aluminum-epoxy composite, and the interface polarization makes the dielectric constant and dielectric loss factor of the aluminum-anodized film-epoxy composite structure slightly higher than those of the aluminum-epoxy structure. In HVDC electric fields, space charges mainly accumulate at the interface between the electrode and the dielectric, and the anodized film can inhibit the injection of charges into the dielectric. Therefore, as an effective interface modification method, anodic oxidation can enhance the mechanical and electrical properties of aluminum electrodes and epoxy resin.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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