Abstract
FT-IR spectra of polyamide cured epoxy films were collected after exposure to electrolytes containing the ions found in blister solutions on AA2024-T3 substrates, and oxidants in order to study the stability of the resin materials over time. The epoxy films displayed excellent chemical stability to all environments tested. However, analysis of the change in the OH and NH stretching bands (3200–3500cm−1) as a function of the electrolyte composition suggested that the epoxy coating behaved as a cation-exchange membrane with specific selectivity for different cations. It was proposed that the uptake of solvated protons is less favorable in the presence of competing cations such as Cu(II), Zn(II) or Al(III). Additionally, the interaction between the polymer and the cations is explained by the presence of chelating ligands constituted by nitrogen and oxygen moieties separated by two carbon atoms within the structure of the cured epoxy resin.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
