Analysis of Phase Distribution for Ceramic Coatings Formed by Microarc Oxidation on Aluminum Alloy |
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| Authors: | Wenbin Xue Zhiwei Deng Yonchun Lai Ruyi Chen |
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| Affiliation: | Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, People's Republic of China |
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| Abstract: | The phase distribution for ceramic coatings formed by microarc oxidation (MAO) on 2024 aluminum alloy was investigated using X-ray diffraction. The results showed that the ceramic coatings mainly consisted of α-Al2O3 and γ-Al2O3 phases. The percentage of α-Al2O3 gradually increased from the external surface to the interface between the coating and the substrate of samples. The surface layer of coatings mainly contained the γ-Al2O3 phase, and its fraction of the composition remained almost constant with oxidation time. It is believed that the difference in the amounts of α-Al2O3 and γ-Al2O3 phases in the different layers of coatings was caused by the various cooling rates of molten Al2O3, which temporarily existed in the microarc zone. |
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