Abstract
In this paper, the UV-assisted sol–gel route was employed to fabricate the TiO2 pore-sealing films on the micro-arc-oxidized (MAO) aluminum alloys (MAO/Al). As compared with the TiO2 film derived from traditional sol–gel method, the UV-irradiated TiO2 film showed a structure with less cracks, resulting in enhanced electrode potential, higher impedance, and lower corrosion current. Further, we investigated and compared the properties of the UV-treated amorphous oxides, including the TiO2, ZrO2, and TiO2-ZrO2 films on MAO/Al. It was found that their corrosion resistances were related to the metallic–oxygen–metallic (M–O–M) lattice in the films. The MAO/Al sealed with UV-irradiated ZrO2 pore-sealing film showed higher corrosion resistance than the samples sealed with UV-irradiated TiO2 film or TiO2-ZrO2 film, which was owing to the fact that a larger amount of M–O–M lattice formed in the UV-ZrO2 film during the UV irradiation.
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