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Étude des mécanismes d'adhésion entre une surface d'oxyde et hydroxyde métallique (modèle et industrielle) et un polymère type époxy. Caractérisation de l'interface et de l'interphase

Abstract : New generation of metallic coatings based on zinc, aluminum and magnesium chemistry (ZM) developed by ArcelorMittal allows a higher corrosion resistance with a thinner layer than standard galvanized steel GI. However, its homologation for bonding structure application in automobile sector is a problem because of observation of adhesive failure after lap shear test with crash adhesive unlike GI coatings. This work’s aim is to understand the reason(s) behind the adhesive failure in order to resolve this problem by proposing industrial solutions. Thus, a multi-technical and multi-scale strategy (XPS, IRRAS, Raman, AFM,… ) was developed to characterize the metallic surface and its oxides, interactions between these oxides and the reactive components of the adhesive, namely the epoxide resin (DGEBA) and the hardener (DDA) and finally the whole system, i.e. ZM/adhesive. It was demonstrated that ZM surface chemistry is far more complex than GI surface chemistry and is dominated by rich magnesium phases and low in zinc oxides/hydroxides unlike GI leading to a different reactivity towards DGEBA and DDA. In particular, the DDA trapping by interaction with magnesium disrupts reticulation process in a chemical interphase and interaction of the polymeric network with colloidal silica and mineral fillers (calcium types) in a mechanical interphase which is weakening the adhesive mechanical anchoring. Several solutions like application of surface treatments can be proposed to solve the negative effect of magnesium
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File URL :
http://docnum.univ-lorraine.fr/prive/DDOC_T_2014_0067_PELISSIER.pdf
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https://hal.univ-lorraine.fr/tel-01750774
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Submitted on : Thursday, March 29, 2018 - 12:54:34 PM
Last modification on : Friday, February 26, 2021 - 2:42:02 PM

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  • HAL Id : tel-01750774, version 1

Citation

Krystel Pélissier. Étude des mécanismes d'adhésion entre une surface d'oxyde et hydroxyde métallique (modèle et industrielle) et un polymère type époxy. Caractérisation de l'interface et de l'interphase. Alimentation et Nutrition. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0067⟩. ⟨tel-01750774⟩

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