Potential Aminoquinone Inhibitors of CE and BMI/Carbon Fiber/Aluminum Composite Galvanic Degradation
NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
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Bismaleimide BMI and cyanate ester CE resins are susceptible to degradation by hydrolysis. The chemical conditions necessary to effect resin hydrolysis can be generated by galvanic activity induced in resincarbon fibermetal composite structures by salt waterair environments. The objective of this study was to identify resin additives that mitigate resin hydrolysis by mediating the production of chemically basic galvanic corrosion byproducts. A number of aminoquinone compounds were both synthesized and procured for testing as potential inhibitors of the galvanic degradation observed in CE and BMI resincarbon fiberaluminum composite structures. It was found that compounds that indicated redox activity in nonaqueous cyclic voltammetry testing, and were soluble in the resin matrix, provided levels of resin hydrolysis protection. This was shown in model CE composites with carbon fiber 70 by weight under accelerated exposure conditions. The use of these inhibitors in certain aircraft composite structures could either alleviate the requirements for extensive structures overdesign or provide additional degradation protection.
- Laminates and Composite Materials
- Properties of Metals and Alloys