| Title: | The effect of pore sealing in a multilayer ▫Si–O–Zr/Al_2O_3▫ coating designed to protect aluminium from corrosion |
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| Authors: | ID Rodič, Peter, Institut "Jožef Stefan" (Author)
ID Kapun, Barbara, Institut "Jožef Stefan" (Author)
ID Milošev, Ingrid, Institut "Jožef Stefan" (Author) |
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| Files: |  URL - Source URL, visit https://www.mdpi.com/2075-4701/13/12/1960
 PDF - Presentation file, download (11,89 MB)
MD5: D44C9257F673B17B835A46D12276981F
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | 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. |
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| Keywords: | aluminum, corrosion, hybrid sol-gel, atomic layer deposition, pore sealing |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 21.10.2023 |
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| Article acceptance date: | 28.11.2023 |
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| Publication date: | 30.11.2023 |
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| Publisher: | MDPI |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-23 |
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| Numbering: | Vol. 13, iss. 12, [article no.] 1960 |
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| Source: | Švica |
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| PID: | 20.500.12556/DiRROS-22130  |
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| UDC: | 54 |
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| ISSN on article: | 2075-4701 |
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| DOI: | 10.3390/met13121960 |
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| COBISS.SI-ID: | 174730243 |
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| Copyright: | © 2023 by the authors. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 4. 12. 2023;
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| Publication date in DiRROS: | 29.04.2025 |
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| Views: | 693 |
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| Downloads: | 319 |
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