resumo
Plasma electrolytic oxidation (PEO) was applied to functionalise the surface of AA2024 alloy. A potassium titanium-oxide oxalate dihydrate based aqueous electrolyte was used, which allowed the direct formation of a TiO2 surface layer on the aluminium alloy substrate. The effect of PEO treatment time and the additional presence of anatase particles in the electrolyte solution on the surface layer and its properties (corrosion, wear and photocatalytic activity) were investigated. It was found that the coating thickness and surface morphology are strongly dependent on the PEO processing time. However, the phase composition is not much affected by the treatment time and the main coating phase is rutile with a smaller amount of anatase. Adding additional anatase in the form of particles increases the amount of anatase in the coatings. The additional particle addition has only minor effect on the corrosion resistance, but reduces the wear resistance remarkably. Interestingly, the addition of anatase particles and the PEO treatment time are not effective in increasing the photocatalytic activities of the samples.
categoria
Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
autores
Ignjatovic, S; Blawert, C; Serdechnova, M; Karpushenkov, S; Damjanovic, M; Karlova, P; Wieland, DCF; Starykevich, M; Stojanovic, S; Damjanovic-Vasilic, L; Zheludkevich, ML
nossos autores
Maksim Starykevich
Investigador Júnior
Maria Serdechnova
Bolseiro de pós-Doutoramento
Mikhail Zheludkevich
Investigador Principal Convidadoagradecimentos
This work was partially supported by Research Executive Agency (European Commission) in frame of Horizon2020-MSCA/RISE-2018 FUNCOAT project (Grant agreement No. 823942, Development and design of novel multiFUNctional PEO COATings). The authors thank Anton Davydok for the experimental support within DESY beamline experiments. We also thank PETRA III (Hamburg, Germany) for granting the P03 proposal I-20190157 for localized phase composition analysis.