Correlation between microhardness and microstructure of anodic film on 2024 aluminum alloy

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• 作者：Pei Zhang ; Yu Zuo ; Xuhui Zhao …
• 关键词：aluminum alloy ; anodizing ; microhardness ; porosity ; microstructure
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：30
• 期：3
• 页码：586-590
• 全文大小：527 KB
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  [11]Ma S J, Luo P, Zhou H H, et al. Preparation of Anodic Films on 2024 Aluminum Alloy in Boric Acid-Containing Mixed Electrolyte [J]. Trans. Nonferrous Met. Soc. China, 2008, 18(4): 825-30View Article
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• 作者单位：Pei Zhang (1) (2)
  Yu Zuo (1)
  Xuhui Zhao (1)
  Yuming Tang (1)
  Xiaofeng Zhang (1)
  
  1. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
  2. Guangxi Key Laboratory of Farm Products Processing (Cultivation Base), College of Chemistry and Material, Yulin Normal University, Yulin, 537000, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437

文摘

The correlation between the microhardness and microstructure features of anodic films on 2024 aluminum alloy formed in the mixed sulfuric acid/oxalic acid electrolyte was studied using micro-hardness tester and scanning electron microscope (SEM). The results show that the microhardness of the anodic film is influenced by the microstructure of the anodic film such as the film porosity, and the order and continuity of the hexagon columnar cells. The film microhardness increases as the porosity of the anodic film decreases and the order and continuity of the film cells increase. With the same current density, as the anodic film thickens with anodizing time, the film microhardness increases because the film porosity decreases and the order and continuity of the cells are also improved. Under the condition of the same anodizing time, as the current density increases, the film microhardness decreases due to the higher film porosity and the poorer order and continuity of the film cells. The film porosity increases because the increased current density can accelerate the oxidation reaction, strengthen the filed-assisted dissolution and the heating effect in the anodic film, resulting in decreased film order and continuity.