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Volume 42 Issue 5
May  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(5): 1046-1054.
WANG Xuefei, LI Songmei, LIU Jianhua, et al. Corrosion resistance of sulfuric-adipic acidic film for 2198 aluminum alloy[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(5): 1046-1054. doi: 10.13700/j.bh.1001-5965.2015.0342(in Chinese)
Citation: WANG Xuefei, LI Songmei, LIU Jianhua, et al. Corrosion resistance of sulfuric-adipic acidic film for 2198 aluminum alloy[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(5): 1046-1054. doi: 10.13700/j.bh.1001-5965.2015.0342(in Chinese)
shu

Corrosion resistance of sulfuric-adipic acidic film for 2198 aluminum alloy

doi: 10.13700/j.bh.1001-5965.2015.0342

  • School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 26 May 2015
  • Publish Date: 20 May 2016
    Abstract
  • 2198 Al-Li alloys were anodized in sulfuric-adipic acid bath, and then protected by boiling water sealing treatment. The surface morphology and cross-sectional morphology of the anodic film were evaluated by field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM).The corrosion properties of the anodic film were analyzed by electrochemical impedance spectroscopy (EIS), Tafel curve and immersion test. The anodic samples were respectively immersed in sodium chloride solution for different time, then EIS was used to analyze the corrosion behavior. The results show that some holes of the anodic film are connected because of the copper alloy phases. The result of EIS shows that the corrosion resistance of the anodic film after sealing treatment increases obviously, equivalent circuit changes with extension of immersion time, and the impedance of the porous and barrier layers decreases, so immersion process could change the structure of the anodic film and decrease the corrosion resistance.

     

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