Article
2022

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
Russian Journal of Electrochemistry
https://doi.org/10.1134/S1023193522060076
Abstract / Full Text
Medvedev, I.M., Kutyrev, A.E. & Volkov, I.A. The Study of the Corrosion Damage Influence on the Impedance of Anodic Oxide Coatings. Russ J Electrochem 58, 471–481 (2022). https://doi.org/10.1134/S1023193522060076

Abstract—

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

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