Title: Investigating the effect of electrolyte concentration and chemical composition on the photocatalytic behavior of coatings created on aluminum alloy by plasma electrolytic oxidation

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Title: Investigating the effect of electrolyte concentration and chemical composition on the photocatalytic behavior of coatings created on aluminum alloy by plasma electrolytic oxidation

ارائه دهنده: Provider: Golnosh Jadidinezhad

اساتید راهنما: Supervisors: Dr.Omid Imantalab

اساتید مشاور: Advisory Professors: basidr.arash Fattahhosaini and dr Minoo kar

اساتید ممتحن یا داور: Examining professors or referees: Dr.hasan Elmkhah and Dr Mohsen Sheikhi

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: آمفی تئاتر

چکیده: Abstract: Abstract: In this study, the photocatalytic properties and corrosion resistance of coatings formed on aluminum surfaces using the Plasma Electrolytic Oxidation (PEO) process were investigated. The primary objective of this research was to enhance the photocatalytic performance and increase the coating’s stability against corrosion by incorporating titanium oxide (TiO₂) nanoparticles and optimizing process parameters. The structure, chemical composition, and morphology of the coatings were analyzed using microscopic and spectroscopic techniques. Microstructural analyses revealed that the produced coatings consist of three distinct layers: an outer porous layer, a compact intermediate layer, and an inner barrier layer. The uniform distribution of TiO₂ nanoparticles within the coating structure led to increased porosity and reduced grain size, which in turn improved photocatalytic properties and increased the active surface area. Spectroscopic analyses indicated that, in addition to TiO₂, the chemical composition of the coating includes aluminum oxides and other ceramic compounds that play a significant role in enhancing the coating’s strength and adhesion. Furthermore, electrochemical tests demonstrated that the modified coatings exhibited higher electrochemical resistance compared to conventional coatings. A significant reduction in corrosion rate in aggressive environments and improved chemical stability were among the key findings of this study. The evaluation of the photocatalytic performance of the coatings in degrading organic pollutants showed a considerable increase in pollutant decomposition rates under visible light and optimized conditions. This highlights the high potential of these coatings for environmental applications such as wastewater treatment and the removal of harmful organic compounds from water. Overall, this study indicates that optimizing the PEO process parameters in combination with the addition of TiO₂ nanoparticles can result in coatings with enhanced photocatalytic performance and superior corrosion resistance. These findings can serve as an effective approach for designing and developing smart coatings for various industrial applications, including water purification, energy production, and materials engineering. Finally, future research is recommended to explore the effects of other nanoparticles and electrolyte modifications to further improve the photocatalytic and mechanical properties of these coatings.

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