Characterization of the water–titanium interaction and its effect on the adhesion of titanium-C/PEKK joints. (November 2022)

• Record Type: Journal Article
• Authors: Marinosci, V.M.; Chu, L.; Grouve, W.J.B.; Wijskamp, S.; Akkerman, R.; de Rooij, M.B.
• Is Part Of: Composites. Volume 162(2022)
• Publication Date: 2022-11
• Subjects: Hybrid -- Environmental degradation -- Surface analysis -- Joints; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2022.107107
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: This study investigates the mechanisms governing the degradation of co-consolidated titanium-C/PEKK interfaces. Atomic force microscopy was used to demonstrate that the titanium-oxide surface adsorbs moisture. Combined with the diffusion of water molecules through the composite tape material, this causes a severe deterioration of the co-consolidated titanium-C/PEKK interfacial toughness, as measured by means of a mandrel peel test on conditioned specimen. A partial recovery of the interfacial toughness after drying of the specimens indicates that the degradation is reversible, providing evidence that the interaction between titanium and C/PEKK is predominantly characterized by secondary bonds. Highlights: The water molecules diffuse through C/PEKK when exposing titanium-C/PEKK joints in hot-wet environment. The water molecules that reach the interface are majorly adsorbed by the titanium surface. The adsorbed water layer causes a drop of the fracture toughness of the titanium-C/PEKK interfaces. Titanium-C/PEKK bond degradation is reversible as the toughness recovers when re-drying the specimens. The toughness recovery is an indication that the titanium-C/PEKK adhesion relies on physical interactions.