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HomeInfluences of the electro galvanizing process on the surface topography alterations (ELOTOP)
Final report
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Steel flat products can be well protected against corrosion by zinc coatings. For electro-coated steel strip, definition of the roughness by skin-passing takes place before galvanizing. This is possible, because the electro-galvanizing process reproduces the surface morphology very well, in particular in comparison to the hot-dip galvanizing process. Roughness is an important product property regarding deep drawing and painting properties. In few cases, the replication of the substrate topography is less accurate than desired. These cases need extra effort that could be reduced by a better understanding of the underlying mechanisms responsible for the local zinc deposition. Aim of this project was to investigate the electrolytic zinc coating process in lab and production trials and to develop a model to simulate the theoretical plating process. Focus was put on topography and steel grade of the primary material, process configuration and parameters, as well as composition of the electrolyte. Goal of these activities was to predict the final roughness of the coating in relation to the initial roughness of the steel surface. The main roughness parameters used for the evaluation were Ra (average roughness) and RPc (peak count), expressed as the change in roughness by the deposition: ΔRa = Razinc - Rasteel and ΔRPc = RPczinc - RPcsteel. For the consideration of process parameters we introduced the quotient of the deposition current and the maximum current limited by electrochemical boundary conditions, i/ilim. This dimensionless factor enabled to compare different electro-galvanizing processes with varying setups.
- Published:
- Corporate author(s): Directorate-General for Research and Innovation (European Commission)
- Personal author(s): Bán, A ; Berends, H ; Buttler, A ; Debeaux, M ; Gerdenitsch, J ; Holdinghausen, A ; Kurzynski, J
- Themes: Basic metals industry, steel industry , Industrial research and development
- Subject: electrometallurgy , iron and steel industry , materials technology , metal coating , production planning , research project , research report , steel
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| ISSN 1831-9424 | ISBN 978-92-79-57019-3 | DOI 10.2777/039463 | Catalogue number KI-NA-27777-EN-N |
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| ISSN 1018-5593 | ISBN 978-92-79-57018-6 | DOI 10.2777/651197 | Catalogue number KI-NA-27777-EN-C |
- Released on EU publications website:
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