| Title: | Complementary corrosion protection of cast AlSi7Mg0.3 alloy using Zr-Cr conversion and polyacrylic/siloxane-silica multilayer coatings |
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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.nature.com/articles/s41529-024-00467-5
 PDF - Presentation file, download (8,28 MB)
MD5: 0BCF588C68798D2157938A955BFFBE43
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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: | Aluminium cast alloy AlSi7Mg0.3 is a lightweight metal commonly used in automotive, aeronautical and mechanical applications. It has good corrosion resistance but, under harsh operative conditions, would benefit from additional protection. In this study, a corrosion-protective multilayer coating system for AlSi7Mg0.3 based on hexafluoro-zirconated trivalent chromium coating (Zr-CrCC) and polyacrylic/siloxane-silica (PEHA-SS) coating was developed. The Zr-CrCC was formed by immersion of the substrate in a commercial conversion bath (SurTec® 650). PEHA-SS synthesis was based on organic precursors (2-ethylhexyl acrylate and [3-(methacryloyloxy)propyl]trimethoxysilane) and an inorganic precursor, tetraethyl orthosilicate. After deposition on AlSi7Mg0.3, each coating was first characterised individually, followed by the analysis of the multilayer using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The adhesion of the coatings was evaluated with a cross-hatch cut test. The corrosion studies in sodium chloride solution using electrochemical impedance spectroscopy and salt spray testing showed that the multilayer system is superior to individual Zr-CrCC and PEHA-SS coatings. After 4 months in 0.1 M NaCl, the multilayer-coated samples exhibited the impedance at 10 mHz in the range of GΩ cm2, while scribed samples withstood the corrosion attack in a salt spray chamber for one week. Thus, albeit only about 100 nm thick, the Zr-CrCC deposited between the substrate and a 9-micrometre thick barrier sol-gel PEHA-SS coating acts as an active corrosion protection interlayer and contributes to the overall protectiveness of the multilayer system. |
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| Keywords: | corrosion-protective, aluminium, material |
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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: | 19.04.2024 |
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| Publication date: | 28.05.2024 |
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| Publisher: | Springer Nature |
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| Year of publishing: | 2024 |
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| Number of pages: | str. 1-16 |
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| Numbering: | Vol. 8, article no. 58 |
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| Source: | Švica |
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| PID: | 20.500.12556/DiRROS-22057  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 2397-2106 |
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| DOI: | 10.1038/s41529-024-00467-5 |
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| COBISS.SI-ID: | 197709827 |
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| Copyright: | © The Author(s) 2024 |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 4. 6. 2024;
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| Publication date in DiRROS: | 17.04.2025 |
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| Views: | 577 |
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| Downloads: | 265 |
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