Study of zirconium dioxide based PEO-coatings with finely dispersed particles of yttrium oxide additives

• A.A. Chirkunov¹, S.V. Savushkina² and M.V. Gerasimov¹

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² Moscow Aviation Institute (National Research University), Volokolamskoe sh. 4, 121552 Moscow, Russian Federation

Abstract: The effect of Y₂O₃ particles with different sizes on the characteristics of thick ZrO₂/YSZ PEO composite coatings obtained on E110 alloy was studied. The coatings were investigated using scanning electron spectroscopy, X-ray spectral analysis, potentiodynamic polarization studies, and impedance spectroscopy. The thickness of the coating obtained with the addition of submicron yttrium oxide particles is higher than for the coating without additives. The addition of yttrium oxide nanoparticles led to a decrease in the coating thickness. The yttrium content is higher for the coating obtained with the addition of nanoparticles, both in the outer layer (~6 at.%) and in the inner layer (~2 at.%), compared to the coating with the addition of submicron particles (~5 and 1 at.%, respectively). The resistance/thickness ratio of the outer layer is higher for PEO-coating with submicron Y₂O₃ particles. The overall and inner layer resistance/thickness ratio is the highest for PEO-coating with yttrium oxide nanoparticles addition. The electrochemical behavior of the studied samples was mainly determined by a thicker and denser inner layer. The introduction of nanosized particles contributed to the formation of a denser and more uniform inner layer.

Keywords: plasma electrolytic oxidation, PEO-coating, zirconium dioxide, yttrium oxide particles, electrochemical impedance spectroscopy

Int. J. Corros. Scale Inhib., 2025, 14, no. 1, 155-168
doi: 10.17675/2305-6894-2025-14-1-9

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