Oct, 31, 2024

Vol.57 No.5

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Review

  • The Korean Society of Surface Science and Engineering
  • Volume 57(1); 2024
  • Article

Review

The Korean Society of Surface Science and Engineering 2024;57(1):8-13. Published online: Feb, 28, 2024

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DOI : doi.org/10.5695/JSSE.2024.57.1.8

Dielectric breakdown of anodic oxide films formed on AA6061 in 20% H2SO4 and 8% H2SO4+ 3% C2H2O4 solutions

  • Cheolgi Parka, Jaehwak Janga, Yunsuk Hyuna and Sungmo Moonb,c*
    aR&D Center, As Tech, Republic of Korea bSurface Technology Division, Korea Institute of Materials Science, Republic of Korea cAdvanced Materials Engineering, Korea University of Science and Technology, Republic of Korea
Abstract

Anodizing of Al6061 alloy was conducted in two different electrolytes of 20% sulfuric acid and 8% sulfuric acid + 3 % oxalic acid solutions at a constant current or decreasing current density conditions, and its dielectric breakdown voltage was measured. The surface morphology of anodic oxide films was observed by TEM and thermal treatment was carried out at 400 ℃ for 2 h to evaluate the resistance of the anodic oxide films to crack initiation. The anodic oxide film formed in 8% sulfuric acid + 3 % oxalic acid solution showed higher dielectric breakdown voltage and better resistance to crack initiation at 400 ℃ than that formed in 20% sulfuric acid solution. The dielectric breakdown voltage increased 6 ~12% by applying decreasing current density comparing with a constant current density.

Keywords Anodizing; Oxide film; Al6061 alloy; Constanct current density; Decreasing current density.