Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Dielectric breakdown of anodic oxide films formed on AA6061 in 20% H2O4and 8% H2SO4+ 3% C2H2O4 solutions

20% 황산 및 8% 황산 + 3% 옥살산에서 AA6061 합금 표면에 형성된 아노다이징 피막의 내전압 특성

  • 박철기 ((주)에이에스텍기술연구소) ;
  • 장재확 ((주)에이에스텍기술연구소) ;
  • 현윤석 ((주)에이에스텍기술연구소) ;
  • 문성모 (재료연구소 표면기술연구본부)
  • Received : 2024.02.20
  • Accepted : 2024.02.26
  • Published : 2024.02.29
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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

Acknowledgement

This research was financially supported by a fundamental research program of KIMS (PNK9790).

References

  1. S. Moon, Anodic oxidation treatment methods of metals, Journal of the Korean Institute of Surface Engineering, 51 (2018) 1-10.
  2. Y.S. Jeong, Y. H. Park, K. S. Jang, S. Moon, J. Choi, Y. M. Jeong, Practical surface treatment technology, 5 (2014).
  3. S. Moon, S. Moon, S. Lim, Formation characteristics of hard anodizing films on 6xxx aluminum alloys, Journal of the Korean Institute of Surface Engineering, 52 (2019) 203-210.
  4. S. Moon, K. Jeong, S. Lim, Formation behavior of anodic oxide films on Al6061 alloy in sulfuric acid solution, Journal of the Korean Institute of Surface Engineering, 51 (2018) 393-399.
  5. S. Moon, Y. Nam, C. Yang, Y. Jeong, Growth of anodic oxide films on AC2A alloy in sulphuric acid solution, Corrosion Science, 53 (2011) 1547-1553. https://doi.org/10.1016/j.corsci.2011.01.029
  6. T. Aerts, T. Dimogerontakis, I. D. Graeve, J. Fransaer, H. Terryn, Influence of the anodizing temperature on the porosity and the mechanical properties of the porous anodic film, Surface and Coatings Technology, 201 (2007) 7310-7317. https://doi.org/10.1016/j.surfcoat.2007.01.044
  7. H. V. Pham, D. Kwon, J. Kim, S. Moon, Dielectric breakdown behavior of anodic oxide films formed on pure aluminum in sulfuric acid and oxalic acid electrolytes, Journal of Surface Science and Engineering, 56 (2023) 169-179.
  8. H. Hashimoto, Y. Shigehara, S. Ono, H. Asoh, Heat-induced structural transformations of anodic porous alumina formed in phosphoric acid, Microporous and Mesoporous Materials 265 (2018) 77-83 https://doi.org/10.1016/j.micromeso.2018.01.008