Corrosion inhibition study on Fe-Zn and AA2024-CFRP galvanic couples

• Autor(a) principal: Oliveira, Marco Pinheiro de
• 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/10773/13939
• topic: Ferro - Corrosão; Zinco - Corrosão; Galvanização

While the galvanic joints of Zn and Fe are industrially widespread, the AA2024 and CFRP are widely used together nowadays mostly in aeronautical industry due to their light weight and good mechanical properties. It is also clear that the corrosion problems arise when these materials are galvanically coupled and the corrosion of less noble structural material occurs. Current measures for the protection of the AA2024, especially when galvanically activated, are inefficient or expensive. Therefore novel protection strategies are under development with a significant industrial demand. The main objective of this work was to seek and design new corrosion inhibition strategies for industrially relevant dissimilar material systems where the galvanic combinations occur, such as Zn + Fe and AA2024 + CFRP. The selection of inhibitors contained the single inhibitor systems as well as some dedicated potentially synergistic mixtures. It has found that the corrosion impact on specific galvanic systems can be successfully inhibited by using specially designed and dedicated combinations of corrosion inhibitors based on the synergistic cooperation of their different corrosion inhibition mechanisms. A range of electrochemical techniques such as EIS and ZRA together with a full analysis and modelling of data were systematically used in order to evaluate the corrosion properties for all selected circumstances.