Title page for ETD etd-03142009-040506
|Type of Document
||Holmes, Brenda L.
||Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
||Master of Science
|Dillard, John G.
|Webster, H. F.
|Wightman, James P.
|Date of Defense
A surface pretreatment for aluminum and titanium
involving the reaction of phosphonic acid (RPO(OH)2),
R=butyl or vinyl for aluminum and R=vinyl for titanium, has
been investigated. The durability of phosphonic
acid-pretreated samples was compared with that for P2-etched
(ferric sulfate-sulfuric acid) adherends. Samples were
bonded with LaRC-IA adhesive in a wedge test geometry.
Environmental testing consisted of static and cyclical
exposure for 240 hours in three atmospheres: 1) 170°C, 2
torr; 2) -20°C; 3) 60°C, 70% relative humidity. Crack
propagation arrested within 48 hours. The order of
durability in static environmental tests for aluminum was
vinyl phosphonic acid > P2 > butyl phosphonic acid. The
durability performance was reversed for cyclic testing. The
durability of specimens using P2-etched titanium was
superior to that for vinyl phosphonic acid-treated titanium
in all environmental tests.
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