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HomeSelf-healing at the cut edge of coil-coated galvanised steel
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The major aim of the project was to develop optimised zinc coatings with significantly improved self-healing properties against cut edge corrosion. Although this ambitious aim was not achieved, the project was quite successful in enhancing our understanding of what needs to be considered. We could show that under certain conditions Mg in Zn-Mg definitely has a positive effect on the cut edge, clearly improving the performance by a factor of 5 or more. However, the effect of Mg is not a robust one: for example if these conditions are not met, under immersion in a greater volume, no effect is discernible. This has to be considered when planning the proper use of Zn-Mg. For Al no effect on cut edge protection was found. However, from thermodynamic considerations a positive effect on the alloy corrosion itself can be assumed. The lack of robustness found underlines that the real potential lies in the concept of incorporating nanoparticles into the zinc coating that can release inhibitors where needed, i.e. they themselves are released from the zinc coating during its anodic dissolution and then can migrate/diffuse to the steel surface where they decompose and release their load of inhibitors. In this way localised dispension of inhibitors is possible, i.e. they are release where needed. The desirability of this was shown for the example of phosphate. For global release, such as from an organic coating, phosphate cannot reach its full potential. Only by the targeted release from a nanoparticle can the optimum protection be reached. This project can be regarded as a milestone in this direction. Particularly noteworthy are the progress made in the inhibitor mechanism at the cut edge, novel findings of synergy between zinc and magnesium, the successful synthesis, loading and encapsulation of mesoporous silica nano-particles, the formulation of a theory for the incorporation of nano-particles into zinc, and a first demonstration of the performance of incorporated particles.
- Published:
- Corporate author(s): Directorate-General for Research and Innovation (European Commission)
- Personal author(s): Ogle, K ; Rohwerder, M ; Allély, C
- Themes: Industrial research and development
- Subject: corrosion , industrial research , materials technology , metal coating , resistance of materials , steel , zinc
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| ISSN 1018-5593 | ISBN 978-92-79-14593-3 | DOI 10.2777/8950 | Catalogue number KI-NA-24219-EN-C |
- Released on EU publications website:
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