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Old 16th Jan 2009, 04:20
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blakmax
 
Join Date: Jul 2008
Location: Australia
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A solution to attrition liner disbonds

I am aware of disbonding attrition liners on one type of military fast jet that was occurring over ten years ago. The problem was fixed not by changing adhesives, but by using a more effective surface preparation process. Adhesive bonds function by chemical bonds at the interface, and depending on the type of surface preparation performed at the time of bonding, those chemical bonds may be susceptible to dissociation, usually by hydration of oxides on the metal, and that results in disbonding. The trick is to use a process that provides resistance to hydration. We were able to reduce the repeat-repair rate (for all bonded repairs not just attrition liners) from 43% in 1992 to almost zero by using a more reliable surface preparation process.
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