AbstractTitration and infraed analysis found no primary chemical bonds between etched or unetched aluminum and an amine‐cured epoxy resin. Titration of a very small amount of resin in contact with the large surface area of aluminum dust revealed no drop in epoxy content when oxygen was excluded. The spectra of a bulk‐cured epoxy resin were essentially superimposable on the spectra obtained by attenuated total reflectance and specular reflectance of a very thin layer of the cured epoxy resin bonded to aluminum plate. Analysis of uncured epoxy resin in contact with aluminum plate and powder, subjected to the cure cycle in air, indicated that the epoxy ring is oxidized to a carboxylic acid. When air is excluded, no loss of epoxy groups is obser
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