Mechanisms of Adhesion Failure Between Polymers and Metallic Substrates. Part II. Aluminum 2024-T3 and Titanium 6Al4V with HT424 Adhesive.
Final rept. 1 Apr 74-31 Aug 75,
ROCKWELL INTERNATIONAL THOUSAND OAKS CALIF SCIENCE CENTER
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This report describes the continuation of a study of aluminum 2024-T3 alloy and titanium 6Al-4V alloy adherends, adhesively bonded with epoxy HT424 adhesive. The adherend surface properties, after standard preparation treatments, were characterized with a number of surface tools Ellipsometry, surface potential difference SPD, Auger electron spectroscopy AES, electron, scanning electron and optical microscopy, contact angle, photo electron emission, and light scattering. A study was made of bond strengths after FPL etching and phosphoric acid anodizing and after aging of these surfaces in water vapor and in water. By calibrating the above mentioned instruments for hydroxide and organic films of known chemistry, it has been possible to discern the mechanism of aging degradation. The mechanisms of bond failure have been greatly ellucidated by a careful study of the data. Suggestions are given to improve bond strength and stability based upon the analysis. Author
- Couplers, Fasteners and Joints