Print Email Facebook Twitter Adhesive bonding and corrosion performance investigated as a function of auminum oide chemistry and adhesives Title Adhesive bonding and corrosion performance investigated as a function of auminum oide chemistry and adhesives Author Abrahami, S.T. (TU Delft MSE-6; Material Innovation Institute (M2i)) Hauffman, T. (Free University of Brussels) de Kok, John M.M. (Fokker Aerostructures) Terryn, H.A. (TU Delft MSE-1; Free University of Brussels) Mol, J.M.C. (TU Delft MSE-6) Date 2017 Abstract The long-term strength and durability of an adhesive bond is dependent on the stability of the oxide-adhesive interface. As such, changes in the chemistry of the oxide and/or the adhesive are expected to modify the interfacial properties and affect the joint performance in practice. The upcoming transition to Cr(VI)-free surface pretreatments makes it crucial to evaluate how the incorporation of electrolyte-derived sulfate and phosphate anions from, respectively, phosphoric acid anodizing and sulfuric acid anodizing affect the interfacial chemical properties. Hence, different types of featureless aluminum oxides with well-defined surface chemistries were prepared in this study. The relative amounts of O2−, OH−, , and surface species were quantified using x-ray photoelectron spectroscopy. Next, bonding with two types of commercial aerospace adhesive films was assessed by peel and bondline corrosion tests. The presented results indicate that the durability of the oxide-adhesive interface depends on the interplay between oxide and adhesive chemistries. Epoxy adhesion is highly affected by changes in the oxide surface chemistry, especially the amount of surface hydroxyls. However, the performance of anodic oxides with a lower hydroxyl fraction can be significantly enhanced by the presence of covalent bonds using a silane coupling agent, γ-amino propyl triethoxy. On the contrary, results with Redux 775 adhesive exhibit very low sensitivity to variations in the surface chemistry. Bondline corrosion resistance of the joints is mainly determined by the nature of the adhesive, independent of the varying oxide chemistries. Subject aluminiumaerospaceanodizingcorrosion resistanceepoxysurface preparationX-ray photoelectron spectroscopy To reference this document use: http://resolver.tudelft.nl/uuid:63e4966d-b04c-4de3-a590-5f60c0ed4438 DOI https://doi.org/10.5006/2391 Embargo date 2017-12-06 ISSN 0010-9312 Source Corrosion: journal of science and engineering, 73 (8), 903-914 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2017 S.T. Abrahami, T. Hauffman, John M.M. de Kok, H.A. Terryn, J.M.C. Mol /islandora/object/uuid:63e4966d-b04c-4de3-a590-5f60c0ed4438/datastream/OBJ/view