Mechanical Properties of Adhesively Bonded Aluminum Structures Protected with Hydration Inhibitors,
MARTIN MARIETTA LABS BALTIMORE MD
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The use of several amino phosphonic acids as hydration inhibitors to improve the properties of adhesively bonded aluminum structures has been investigated using T-peel, double-lap-shear, and wedge tests. Each of the inhibitors tested was found to be compatible with epoxy adhesives in a dry environment. Most were also compatible in a hot, humid environment. Examination of both sides of the propagated crack in wedge test specimens treated with nitrilotris methylene phosphonic acid NTMP showed that hydration of the oxide could be slowed sufficiently so that crack propagation occurred prior to it. In this case, the weakest link was the coupling of the inhibitor to the adhesive. Inhibitors designed to strengthen this coupling have been synthesized and are currently being tested.
- Adhesives, Seals and Binders
- Metallurgy and Metallography