20.500.12556/DiRROS-22058 Surface engineering of aerospace aluminium alloys understanding alloying effects on chemical pre-treatment and sol-gel coating adhesion Surface engineering of aerospace aluminium alloys: understanding alloying effects on chemical pre-treatment and sol-gel coating adhesion The sol–gel process is a chemical surface preparation method based on hydrolysis and polycondensation reactions for enhanced adhesion for metallic substrates in adhesive bonding and coating applications. This paper describes an investigation into the effect of the microstructural complexity of two commonly used aerospace aluminium alloys (AAs) 2024-T3 and 7075-T6, on the response to different surface pre-treatments before deposition of the sol-gel coating and subsequent adhesive bonding. Different surface pre-treatments, including two abrasive treatments and three chemical surface pre-treatments were used, and their effect on surface chemistry, wettability and roughness was assessed. Surfaces were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, profilometry and static contact angles. A hybrid silane sol-gel film was deposited on the differently pre-treated aluminium alloys, an epoxy adhesive was applied and the adhesion properties were evaluated using pull-off testing. The role of the altered physicochemical properties of the pre-treated surfaces was related to the adhesion strength of the sol–gel reinforced epoxy/aluminium interfaces. The microstructural complexity of the aerospace alloys caused non-uniform responses to the pre-treatments, proving the importance of compatibility between material and treatment conditions. Statistical analysis revealed that, despite that overall higher adhesion values were obtained on rougher surfaces, only a strong correlation exists between the surface hydroxyl fraction and adhesion strength. The relation of roughness and water contact angle to interfacial adhesion was found to be non-significant. The findings of this study underscore the critical role of surface pre-treatments and their impact on adhesion strength in aerospace aluminium alloys, providing valuable insights for the effective utilization of sol-gel coatings in adhesive bonding and coating processes. sol-gel surface pre-treatment surface morphology wettability adhesive sol-gel predobdelava površin true false false Elsevier Nizozemska Angleški jezik Slovenski jezik © 2024 The Authors. Neznano 2025-04-17 13:19:02 2025-04-17 13:19:02 2025-10-24 03:50:27 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Soavtorji iz Slovenije: Urša Tiringer, Ingrid Milošev, Janez Kovač; Opis vira z dne 13. 5. 2024; str. 1-15 Vol. 485, [article no.] 130901 Jun. 2024 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-06-01 621.7+621.9 1879-3347 10.1016/j.surfcoat.2024.130901 195212035 https://www.sciencedirect.com/science/article/pii/S0257897224005322?via%3Dihub 1 c5655d29-1b7d-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31863 RAZ_Van_Dam_J.B.P._2024.pdf RAZ_Van_Dam_J.B.P._2024.pdf 1 FF5FE9FDEA3FB2DB57799CE5D1ABE240 9d463ee0046615274b1613b7a13ae9d05bb46e1621709feed8d6babc7ef1d668 05566893-1b80-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31864 Institut Jožef Stefan 0 0 0