Silane and epoxy coatings: A bilayer system to protect AA2024 alloy
This work has proved that a good combination of a simple and fast metal pre-treatment, followed by the deposition of a thin layer of an organic-inorganic silane coating and further layer of epoxy coatings, are able to protect the aluminium alloy AA2024-T3 against corrosion in high concentrations of...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/76717 |
| Acceso en línea: | https://hdl.handle.net/2117/76717 https://dx.doi.org/10.1016/j.porgcoat.2014.12.014 |
| Access Level: | acceso abierto |
| Palabra clave: | Titanium alloys Coatings Sol-gel technology Epoxy coatings Silane compounds Aluminium alloy Corrosion assays sol-gel coatings self-assembled monolayers native-oxide surface corrosion protection aluminum-alloy hybrid materials spectroscopy films performance inhibition Alumini -- Aliatges -- Corrosió Revestiments protectors Àrees temàtiques de la UPC::Enginyeria química |
| Sumario: | This work has proved that a good combination of a simple and fast metal pre-treatment, followed by the deposition of a thin layer of an organic-inorganic silane coating and further layer of epoxy coatings, are able to protect the aluminium alloy AA2024-T3 against corrosion in high concentrations of NaCl solution, The alloy AA2024 is one of the most employed aluminium alloy in structural applications due to its good mechanical properties. However, AA2024 alloy series commonly presents galvanic corrosion due to the rich content of copper element. The influence of different surface pre-treatments, the presence of a silane layer as pre-coating treatment and the influence of phosphonic acids combined with the silane layer on the corrosion protection and adhesion to the aluminium alloy have been examined using accelerated corrosion tests. High roughness and the presence of a pre-coating film between the metal surface and the organic coating were essential for a good protection and resistance to blistering appearance in the surface of AA2024-T3. (C) 2014 Elsevier B.V. All rights reserved. |
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