Properties of UV-irradiated TiO2, ZrO2, and TiO2-ZrO2 films as pore-sealing layers on micro-arc-oxidized aluminum alloys
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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.
UV-assisted sol-gel ZrO2, TiO2, and TiO2-ZrO2 layers were prepared on micro-arc oxidized aluminum alloys.
The ZrO2 pore-sealing layer showed enhanced anti-corrosion properties than that of TiO2, and TiO2-ZrO2 layers.
The formation of M-O-M bonds was contributed to the enhancement of anti-corrosion properties.
KeywordsUV irradiation Corrosion Micro-arc oxidation Aluminum alloys
This work is supported by the National Key Research and Development Program of China (2017YFB1102801), the Open Project for Key Laboratory of Intense Dynamic Loading and Effect (KLIDLE1801), the Aviation Science Foundation Project (20170970002) and the Natural Science Foundation of Shaanxi Provincial Department of Education (No. 17JK0571).
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Conflict of interest
The authors declare that they have no conflict of interest.