The Study of the Corrosion Damage Influence on the Impedance of Anodic Oxide Coatings

I. M. Medvedev I. M. Medvedev , A. E. Kutyrev A. E. Kutyrev , I. A. Volkov I. A. Volkov
Російський електрохімічний журнал
Abstract / Full Text


Changes in impedance spectra of hot-water sealed and unsealed coatings at the aluminum alloy from the Al–Cu–Li–Zn-system during their corrosion testing in NaCl solution and salt spray chamber are studied. During the testing in NaCl solution, the coatings’ barrier properties are severely degraded after the appearance of corrosion damage spots, which manifests itself in the lowering of the impedance modulus in low-frequency region. The NaCl solution induced rapid growth of corrosion area, the more so, for the unsealed coating. Compared to the NaCl solution testing, the growth of corrosion spots is by order of magnitude slower for the salt-spray testing, at which the isolated corrosion damage spots are prevailing.

Author information
  • All-Russian Research Institute of Aviation Materials (VIAM), Moscow, Russia

    I. M. Medvedev, A. E. Kutyrev & I. A. Volkov

  1. Kablov, E.N., G.V. Akimov, the founder of the Russian corrosion school, Korroziya: Materialy, Zashchita (in Russian), 2011, no. 11, p. 3.
  2. Antipov, V.V., Prospects for development of aluminum, magnesium and titanium alloys for aerospace engineering, Aviation Materials and Technologies (in Russian), 2017, no. S, p. 186. https://doi.org/10.18577/2071-9140-2017-0-S-186-194
  3. Chesnokov, D.V., Antipov, V.V., and Kulyushina, N.V., The method of accelerated laboratory tests of aluminum alloys for determination of their corrosion resistance in conditions of the sea atmosphere, Trudy VIAM (in Russian), 2016, no. 5(41), p. 10. https://doi.org/10.18577/2307-6046-2016-0-5-10-10
  4. Kablov, E.N., Startsev, O.V., and Medvedev, I.M., Review of international experience on corrosion and corrosion protection, Aviation Materials and Technologies (in Russian), 2015, no. 2(35), p. 76. https://doi.org/10.18577/2071-9140-2015-0-2-76-87
  5. Wang, S., Peng, H., Shao, Z., Zhao, Q., and Du, N., Sealing of anodized aluminum with phytic acid solution, Surf. Coatings Technol., 2016, vol. 286, p. 155. https://doi.org/10.1016/j.surfcoat.2015.12.024
  6. Carangelo, A., Curioni, M., Acquesta, A., Monetta, T., and Bellucci, F., Application of EIS to in situ characterization of hydrothermal sealing of anodized aluminum alloys: Comparison between hexavalent chromium-based sealing, hot water sealing and cerium-based sealing, J. Electrochem. Soc., 2016, vol. 163, p. C619. https://doi.org/10.1149/2.0231610jes
  7. Prada Ramirez, O.M., Queiroz, F.M., Terada, M., Donatus, U., Costa, I., Olivier, M.G., and de Melo, H.G., EIS investigation of a Ce-based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA, Surf. Interface Anal., 2019, vol. 51, p. 1260. https://doi.org/10.1002/sia.6633
  8. García-Rubio, M., de Lara, M.P., Ocón, P., Diekhoff, S., Beneke, M., Lavía, A., and García, I., Effect of post-treatment on the corrosion behaviour of tartaric-sulphuric anodic films, Electrochim. Acta, 2009, vol. 54, p. 4789. https://doi.org/10.1016/j.electacta.2009.03.083
  9. Zhao, X.H., Zuo, Y., Zhao, J.M., Xiong, J.P., and Tang, Y.M., A study on the self-sealing process of anodic films on aluminum by EIS, Surf. Coatings Technol., 2006, vol. 200, p. 6846. https://doi.org/10.1016/j.surfcoat.2005.10.031
  10. Whelan, M., Cassidy, J., and Duffy, B., Sol–gel sealing characteristics for corrosion resistance of anodized aluminum, Surf. Coatings Technol., 2013, vol. 235, p. 86. https://doi.org/10.1016/j.surfcoat.2013.07.018
  11. Lee, J., Jung, U., Kim, W., and Chung, W., Effects of residual water in the pores of aluminum anodic oxide layers prior to sealing on corrosion resistance, Appl. Surf. Sci., 2013, vol. 283, p. 941. https://doi.org/10.1016/j.apsusc.2013.07.047
  12. Jüttner, K., Lorenz, W.J., and Paatsch, W., The role of surface inhomogeneities in corrosion processes-electrochemical impedance spectroscopy (EIS) on different aluminum oxide films, Corros. Sci., 1989, vol. 29, p. 279. https://doi.org/10.1016/0010-938X(89)90036-X
  13. Mansfeld, F., Evaluation of Anodized Aluminum Surfaces with Electrochemical Impedance Spectroscopy, J. Electrochem. Soc., 1988, vol. 135, p. 828. https://doi.org/10.1149/1.2095786
  14. Hitzig, J., Jüttner, K., Lorenz, W.J., and Paatsch, W., AC-Impedance Measurements on Corroded Porous Aluminum Oxide Films, J. Electrochem. Soc., 1986, vol. 133, p. 887. https://doi.org/10.1149/1.2108756
  15. Antipov, V.V., Medvedev, I.M., Kutyrev, A.E., and Zhitnyuk, S.V., The investigation of electrochemical properties of non-sealed oxide coatings on 1163, V-1461, V96C3pch aluminum alloys during accelerated testing, Trudy VIAM (in Russian), 2019, no. 6, p. 51.] https://doi.org/10.18577/2307-6046-2019-0-6-51-64.12
  16. Kablov, E.N., Next-generation materials, Zashhita i bezopasnost` (in Russian), 2014, no. 4, p. 28.
  17. Antipov, V.V., Medvedev, I.M., Kutyrev, A.E., and Volkov, I.A., Rapid assessment of hot water sealed anodic oxide coatings protective properties during NaCl immersion testing, Trudy VIAM (in Russian), 2019, no. 8(80), p. 67. https://doi.org/10.18577/2307-6046-2019-0-8-67-78
  18. Antipov, V.V., Medvedev, I.M., Kutyrev, A.E., and Volkov, I.A., Development of method for rapid evaluation of protective properties of anodic oxide coatings during neutral salt spray chamber testing, Korroziya: Materialy, Zashchita (in Russian), 2021, no. 3, p. 42. https://doi.org/10.31044/1813-7016-2021-0-3-42-48