Characterization of nanomechanical and structural properties of an adhesive joint between two galvanized steel plates by Atomic Force Microscopy and Raman spectroscopy

摘要

The cross section study of adhesive joint between two galvanized steel sheets by Raman and AFM force spec-troscopies has allowed us to: ⅰ) Map the spatial distribution of elastomeric nodules within the epoxy matrix. This distribution was heterogeneous. No clear difference was seen between the metallic coating/adhesive interface and the center of the adhesive joint. ⅱ) Study the nanomechanical properties of the adhesive joint. The Young's modulus distribution obtained near the metallic coating/adhesive interface is homogeneous and centered around 3 GPa. This is not the case at the center of the joint, for which a broad distribution, including Young's moduli superior to 10 GPa, is obtained. This difference could be is due to a depletion layer of fillers at the interface with the metallic coatings. Moreover in the center of the joint, fillers could interact with tip resulting in the highest Young's moduli. This study clearly demonstrates the ability of Raman and AFM force spectroscopies to reveal interesting structural information of an adhesive joint with a complete industrial system.