20.500.12556/DiRROS-22130 The effect of pore sealing in a multilayer ▫Si–O–Zr/Al_2O_3▫ coating designed to protect aluminium from corrosion This study deals with the combination of two corrosion protection strategies for aluminium: barrier protection (provided by a 3.8 μm thick hybrid sol–gel coating) and aluminium pore sealing via the use of a 100 nm thick layer of aluminium oxide. A Si–O–Zr hybrid sol–gel coating (TMZ) was synthesised by combining two separately prepared sols (i) tetraethyl orthosilicate and 3-methacryloxypropyl trimethoxysilane and (ii) zirconium(IV) n-propoxide chelated with methacrylic acid. The synthesis of the Si–O–Zr hybrid sol–gel was evaluated at various stages using real-time infrared spectroscopy. A 100 nm thick Al2O3 film was prepared via thermal atomic layer deposition at 160 °C using trimethyl aluminium and water as precursors. The coating and film properties were assessed via focused ion beam/scanning electron microscopy coupled with energy-dispersive X-ray spectrometry. Sealing with the Al2O3 film did not affect the microstructure and composition of the underlying sol–gel coating. The coating’s corrosion performance in 0.1 M NaCl solution was evaluated using electrochemical impedance spectroscopy. Compared to individual coatings, the multilayer TMZ/Al2O3 coating ensured prolonged (more than three weeks) durable corrosion protection for the aluminium. The impedance magnitude increased by two orders compared to the uncoated substrate (|Z|10 mHz from 16 kΩ cm2 to almost 830 MΩ cm2). Thus, the pore sealing of the sol–gel coating using an ALD alumina film produced a protective multilayer coating system, with |Z|10 mHz remaining above 5 MΩ cm2 after four weeks in NaCl solution. aluminum corrosion hybrid sol-gel atomic layer deposition pore sealing true false true MDPI Švica Angleški jezik Ni določen © 2023 by the authors. Neznano 2025-04-29 11:29:53 2025-04-29 11:29:53 2025-10-24 03:50:35 0000-00-00 00:00:00 2023 0 0 Nasl. z nasl. zaslona; Opis vira z dne 4. 12. 2023; str. 1-23 iss. 12, [article no.] 1960 Vol. 13 Dec. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-10-21 2023-11-28 2023-11-30 54 2075-4701 10.3390/met13121960 174730243 https://www.mdpi.com/2075-4701/13/12/1960 1 82541ab5-24dc-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=32006 RAZ_Rodic_Peter_2023.pdf RAZ_Rodic_Peter_2023.pdf 1 D44C9257F673B17B835A46D12276981F ebf679d3e96ebf36fb4f3902ad0424c1b0e6d337d654c828a1a5d2d074daf054 de380a2e-24dc-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=32007 Institut Jožef Stefan 0 0 0