Hygrothermal aging of an epoxy/dicyandiamide structural adhesive – influence of water diffusion on the durability of the adhesive/galvanized steel interface

In the present work, moisture absorption of an original expanded Epoxy/dicyandiamide solid formulation designed for the automotive industry was studied. The first part of work focuses on the bulk of cured adhesive joints, according to the water absorption under hydrothermal aging. Aging in immersion in distilled water at 40°C, associated to gravimetric, InfraRed, and optical microscope analyses, enables to estimate the coefficient of diffusion...