Mechanisms of Interfacial Degradation of Epoxy Adhesive/Galvanized Steel Assemblies: Relevance to Durability
| Autor: | Didier Verchere, P. Calvez, Sophie Bistac, Maurice Brogly, J. Richard |
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| Rok vydání: | 2012 |
| Předmět: |
Surface corrosion
Epoxy adhesive Materials science Scanning electron microscope Surfaces and Interfaces General Chemistry Durability Galvanization Surfaces Coatings and Films symbols.namesake Differential scanning calorimetry Lap joint Mechanics of Materials Materials Chemistry symbols Adhesive Composite material |
| Zdroj: | The Journal of Adhesion. 88:145-170 |
| ISSN: | 1545-5823 0021-8464 |
| Popis: | This study reports on the durability of galvanized steel joints bonded with toughened epoxy adhesive formulations under the influence of temperature and moisture aging. The influence of hydrothermal aging on the substrate and adhesive properties was first determined and then correlated to the durability of bonded joints. The mechanical properties of the adhesively bonded joints were assessed by a shear stress-strain analysis on single lap joints. Experimental results have shown a loss of adherence during aging. Scanning electron microscopy, fourier transform infra-red spectroscopy, and differential scanning calorimetry were conducted to analyze precisely the locus of failure and the failure faces after separation of the interface. Consequently, physical and chemical modifications of the adhesive and surface corrosion of the substrate were observed. A three-step mechanism has been proposed to explain the loss of adhesion during aging. The first step was attributed to adhesive and interface hydrolysis of th... |
| Databáze: | OpenAIRE |
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