Microstructure and corrosion resistance of modified 2024 Al alloy using surface mechanical attrition treatment combined with microarc oxidation process |
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Authors: | Lei Wen Yaming Wang Yu Zhou Lixin Guo Jia-Hu Ouyang |
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Affiliation: | Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China |
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Abstract: | A top ceramic coating was fabricated on the surface mechanical attrition treatment (SMAT) modified nanocrystalline layer of 2024 Al alloy by microarc oxidation (MAO) process. The corrosion resistance of the SMAT-MAO composite coating was studied by EIS. The results show that SMAT-MAO composite coating with 10 μm top ceramic coating exhibited better corrosion resistance, while the SMAT-MAO coating with the thickness of 15 μm showed worse corrosion resistance compared with those simple MAO coatings with same thickness. The formation of a dense passive film at the damaged region caused by the bottom nanocrystalline interface contributed to the improved corrosion resistance property. |
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Keywords: | A Aluminium B EIS C Anodic films C Passive films |
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