Surface Treatments for Moisture Resistance

Critchlow, Gary W.

doi:10.1007/978-3-642-37614-6_3

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…The protection provided by CAA creates a thicker and denser aluminium oxide layer by anodizing, and leads to a porous structure where the bottom of the pores is blocked by the dense barrier layer. In a typical aerospace structure, pores are about 30 nm wide and the oxide is about 1 μm thick [ 8 , 49 , 50 ]. This treatment provides an extreme stable porous surface to be adhesively bonded with consequently improved adhesion properties, as it has been possible to observe for the joints bonded with epoxy and GP formulations.…”

Section: Resultsmentioning

confidence: 99%

Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes

et al. 2017

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The extensive use of adhesives in many structural applications in the transport industry and particularly in the aeronautic field is due to numerous advantages of bonded joints. However, still many researchers are working to enhance the mechanical properties and rheological performance of adhesives by using nanoadditives. In this study the effect of the addition of Multi-Wall Carbon Nanotubes (MWCNTs) with Polyhedral Oligomeric Silsesquioxane (POSS) compounds, either Glycidyl Oligomeric Silsesquioxanes (GPOSS) or DodecaPhenyl Oligomeric Silsesquioxanes (DPHPOSS) to Tetraglycidyl Methylene Dianiline (TGMDA) epoxy formulation, was investigated. The formulations contain neither a tougher matrix such as elastomers nor other additives typically used to provide a closer match in the coefficient of thermal expansion in order to discriminate only the effect of the addition of the above-mentioned components. Bonded aluminium single lap joints were made using both untreated and Chromic Acid Anodisation (CAA)-treated aluminium alloy T2024 adherends. The effects of the different chemical functionalities of POSS compounds, as well as the synergistic effect between the MWCNT and POSS combination on adhesion strength, were evaluated by viscosity measurement, tensile tests, Dynamic Mechanical Analysis (DMA), single lap joint shear strength tests, and morphological investigation. The best performance in the Lap Shear Strength (LSS) of the manufactured joints has been found for treated adherends bonded with epoxy adhesive containing MWCNTs and GPOSS. Carbon nanotubes have been found to play a very effective bridging function across the fracture surface of the bonded joints.

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Section: Resultsmentioning

confidence: 99%

Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes

et al. 2017

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“…For a more in-depth discussion on corrosive de-adhesion, the reader is referred to other literature. 6,9 THE IMPORTANCE OF ORGANIC/INORGANIC ADHESION ON OVERALL COATING PERFORMANCE Despite the extensive amount of research and testing, the mechanisms leading to coating failure are still not fully understood. Several hypotheses have been proposed, but the current conclusion is that there is no single protective mechanism operative in organic coatings.…”

Section: Introductionmentioning

confidence: 99%

Probing the formation and degradation of chemical interactions from model molecule/metal oxide to buried polymer/metal oxide interfaces

et al. 2019

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The mechanisms governing coating/metal oxide delamination are not fully understood, although adhesive interactions at the interface are considered to be an important prerequisite for excellent durability. This review aims to better understand the formation and degradation of these interactions. Developments in adhesion science made it clear that physical and chemical interfacial interactions are key factors in hybrid structure durability. However, it is very challenging to get information directly from the hidden solid/solid interface. This review highlights approaches that allow the (in situ) investigation of the formation and degradation of molecular interactions at the interface under (near-)realistic conditions. Over time, hybrid interfaces tend to degrade when exposed to environmental conditions. The culprits are predominantly water, oxygen, and ion diffusion resulting in bond breakage due to changing acid–base properties or leading to the onset of corrosive de-adhesion processes. Therefore, a thorough understanding on local bond interactions is required, which will lead to a prolonged durability of hybrid systems under realistic environments.

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Structural behavior of double-lap shear adhesive joints with metal substrates under humid conditions

Machalická

Vokáč

Kostelecká

et al. 2018

Int J Mech Mater Des

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Surface Treatments for Moisture Resistance

Cited by 3 publications

References 38 publications

Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes

Toughening of Epoxy Adhesives by Combined Interaction of Carbon Nanotubes and Silsesquioxanes

Probing the formation and degradation of chemical interactions from model molecule/metal oxide to buried polymer/metal oxide interfaces

Structural behavior of double-lap shear adhesive joints with metal substrates under humid conditions

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