Microstructure and corrosion resistance of modified 2024 Al alloy using surface mechanical attrition treatment combined with microarc oxidation process

Microstructure and corrosion resistance of modified 2024 Al alloy using surface mechanical attrition treatment combined with microarc oxidation process
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表面机械磨损处理结合微弧氧化工艺改性2024铝合金的显微组织及耐蚀性能

DOI:
10.1016/j.corsci.2010.09.061
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发表时间:
2011
期刊:
影响因子:
8.3
通讯作者:
Yaming Wang
Yaming Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Lixin Guo;Yu Zhou;Jia-Hu Ouyang;Lei Wen;Yaming Wang

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采用微弧氧化工艺在2024铝合金表面机械研磨处理(SMAT)改性纳米晶层上制备了陶瓷顶层。采用交流阻抗法研究了SMAT-MAO复合涂层的耐蚀性。结果表明,表面陶瓷层厚度为10μm的SMAT-MAO复合涂层具有较好的耐腐蚀性能,而15μm的SMAT-MAO复合涂层的耐腐蚀性能比相同厚度的单微弧氧化涂层差。由于底部纳米晶界面的存在,在损伤区域形成了致密的钝化膜,从而提高了涂层的耐蚀性能。
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 10μm top ceramic coating exhibited better corrosion resistance, while the SMAT-MAO coating with the thickness of 15μm 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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