Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Dielectric Breakdown Behavior of Anodic Oxide Films Formed on Pure Aluminum in Sulfuric Acid and Oxalic Acid Electrolytes

  • Hien Van Pham (Nano-Surface Materials Division, Korea Institute of Materials Science) ;
  • Duyoung Kwon (Nano-Surface Materials Division, Korea Institute of Materials Science) ;
  • Juseok Kim (Nano-Surface Materials Division, Korea Institute of Materials Science) ;
  • Sungmo Moon (Nano-Surface Materials Division, Korea Institute of Materials Science)
  • Received : 2022.12.19
  • Accepted : 2023.06.14
  • Published : 2023.06.30
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Abstract

This work studies dielectric breakdown behavior of AAO (anodic aluminum oxide) films formed on pure aluminum at a constant current density in 5 ~ 20 vol.% sulfuric acid (SA) and 2 ~ 8 wt.% oxalic acid (OA) solutions. It was observed that dielectric breakdown voltage of AAO film with the same thickness increased with increasing concentration of both SA and OA solutions up to 15 vol.% and 6 wt.%, respectively, above which it decreased slightly. The dielectric breakdown resistance of the OA films appeared to be superior to that of SA films. After dielectric breakdown test, cracks and a hole were observed. The crack length increased with increasing SA film thickness but it did not increase with increasing OA film thickness. To explain the reason why shorter cracks formed on the OA films than the SA films after dielectric breakdown test, the generation of tensile stresses at the oxide/metal interface was discussed in relation to porosity of AAO films obtained from cross-sectional morphologies.

Keywords

Acknowledgement

This work was supported by the UST Young Scientist Research Program 2020 through the University of Science and Technology (No. 2020YS19) and by Fundamental Research Program of the Korean Institute of Materials Science (KIMS, PNK9450).

References

  1. J. M. Runge, The metallurgy of anodizing aluminum, first ed., Springer, Cham, Switzerland (2018) 65. 
  2. W. Lee, S. J. Park, Porous anodic aluminum oxide: anodization and templated synthesis of functional nanostructures, Chem. Rev., 114 (2014) 7487-7556.  https://doi.org/10.1021/cr500002z
  3. M. Kim, E. Choi, J. So, J. S. Shin, C. W. Chung, S. J. Maeng, J.Y. Yun. Improvement of corrosion properties of plasma in an aluminum alloy 6061-T6 by phytic acid anodization temperature, J. Mater. Res. Technol., 11 (2021) 219-226.  https://doi.org/10.1016/j.jmrt.2020.12.086
  4. T. C. Cheng, C. C. Chou, The electrical and mechanical properties of porous anodic 6061-T6 aluminum alloy oxide film, J. Nanomater., 16 (2015) 141. 
  5. O. E. Tchufistov, E. A. Tchufistov, A. N. Zolkin, Breakdown voltage and electrical strength of oxide coatings formed on aluminum alloys by electrolytic oxidation methods, Mater. Today: Proc., 38 (2021) 1728-1731.  https://doi.org/10.1016/j.matpr.2020.08.237
  6. S. Wei, L. D. Jie, L. C. Can, J. B. Ling, Improving insulation and thermal conductivity of anodic coating by plasma discharge treatment, AIP Adv., 11 (2021) 025334. 
  7. S. M. Moon, S. I. Pyun, A review of anodizing of aluminium, J. Corros. Sci. Soc. of Kor., 26 (1997) 498-508. 
  8. S. M. Moon, Y. Nam, C. Yang, Y. Jeong, Growth of anodic oxide films on AC2A alloy in sulphuric acid solution, Corros. Sci., 53 (2011) 1547-1553.  https://doi.org/10.1016/j.corsci.2011.01.029
  9. S. H. Moon, S. M. Moon, P. K. Song, A study on the growth and burning of anodic oxide films on Al6061 alloy during anodizing at constant voltages, J. Korean Inst. Surf. Eng., 53 (2020) 15-21. 
  10. S. M. Moon, M. Sakairi, H. Takahashi, Behavior of second-phase particles in Al5052 alloy during anodizing in a sulfuric acid solution: CSLM observation, J. Electrochem. Soc., 151 (2004) B399-B405.  https://doi.org/10.1149/1.1752933
  11. S. M. Moon, S. I. Pyun, The mechanism of stress generation during the growth of anodic oxide films on pure aluminium in acidic solutions, Electrochim. Acta, 43 (1998) 3117-3126.  https://doi.org/10.1016/S0013-4686(97)10194-3
  12. M. Ue, H. Asahina, S. Mori, Anodic
  13. S. H. Moon, S. M. Moon, S. G. Lim, Formation characteristics of hard anodizing films on 6xxx aluminum alloys, J. Korean Inst. Surf. Eng., 52 (2019) 203-210. 
  14. S. M. Moon, K. Jeong, S. G. Lim, Formation behavior of anodic oxide films on Al 6061 alloy in sulfuric acid solution, J. Korean Inst. Surf. Eng., 51 (2018) 393-399.
  15. A. P. Leontiev, I. V. Roslyakov, K. S. Napolskii, Complex influence of temperature on oxalic acid anodizing of aluminium, Electrochim. Acta, 319 (2019) 88-94.  https://doi.org/10.1016/j.electacta.2019.06.111
  16. H. Asoh, T. Sano, Forming hard anodic films on aluminum by anodization in oxalic acid and alcohol, J. Electrochem. Soc., 168 (2021) 103506. 
  17. K. Chernyakova, A. Ispas, R. Karpicz, G. Ecke, I. Vrublevsky, A. Bund, Formation of ordered anodic alumina nanofibers during aluminum anodizing in oxalic acid at high voltage and electrical power, Surf. Coat. Technol., 394 (2020) 125813.
  18. A. G. Owens, D. V. Renaux, V. Cartigny, E. Rocca, Large-pores anodizing of 5657 aluminum alloy in phosphoric acid: An in-situ electrochemical study, Electrochim. Acta, 382 (2021) 138303. 
  19. M. R. Nickel, G. Melligan, T. P. McMullen, R. E. Burrell, The effect of chemical additives in phosphoric acid anodization of aluminum-tantalum thin films, Thin Solid Films, 685 (2019) 245-253.  https://doi.org/10.1016/j.tsf.2019.06.033
  20. T. Kikuchi, M. Yamashita, M. Iwai, R. O. Suzuki, Self-ordering of porous anodic alumina fabricated by anodizing in chromic acid at high temperature, J. Electrochem. Soc., 168 (2021) 093501. 
  21. D. Elabar, A. Nemcova, T. Hashimoto, P. Skeldon, G. E. Thompson, Effect of sulphate impurity in chromic acid anodizing of aluminium, Corros. Sci., 100 (2015) 377-385.  https://doi.org/10.1016/j.corsci.2015.08.019
  22. Z. Ding, B. A. Smith, R. R. Hebert, W. Zhang, M. R. Jaworowski, Morphology perspective on chromic acid anodizing replacement by thin film sulfuric acid anodizing, Surf. Coat. Technol., 350 (2018) 31-39.  https://doi.org/10.1016/j.surfcoat.2018.07.008
  23. T. Kikuchi, D. Nakajima, O. Nishinaga, S. Natsui, R. O. Suzuki, Porous aluminum oxide formed by anodizing in various electrolyte species, Curr. Nanosci., 11 (2015) 560-571. https://doi.org/10.2174/1573413711999150608144742