Active protective treatments for galvanically coupled AA2024 and CFRP

• Autor(a) principal: Vieira, Daniel Eduardo Loureiro
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/13652
• topic: Engenharia de materiais; Revestimentos protectores; Ligas de alumínio; Fibras de carbono; Inibidores de corrosão

VII Abstract In the present work “smart” nanocontainers were synthesized in order to incorporate them into an organic coating and protect against corrosion of the aluminum alloy (AA2024) galvanically coupled with carbon fiber reinforced plastic (CFRP). The containers were loaded with organic (2-mercaptobenzothiazole and 1,2,3 – benzotriazole) and inorganic (metavanadate, tungstate and molybdate) inhibitors in the case of Mg/Al and Zn/Al LDH nanoreservoirs. In the case of the bentonite nanocontainers, the containers were loaded with Ce(NO3)3. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were performed in order to characterize the obtained nanocontainers. The nanocontainers were enbeded into epoxy coating on the surface of model multi-material system (AA2024 galvanically coupled with CFRP). The LDHs loaded with different inhibitors and combined with bentonite loaded with Ce3+, increase the anticorrosion protection properties of the coating. The analyses of the anticorrosion properties of the coatings were performed using zero resistance ammetry (ZRA), electrochemical impedance spectroscopy (EIS), optical microscopy, salt spray test (SST) and scanning vibrating electrode technique (SVET) measurements. The laboratory work was realized in University of Aveiro in collaboration with industrial environment of Airbus group.