Due to the toxicity of chromate corrosion inhibitors and the ever tightening environmental regulations surrounding their use and disposal, there is great interest in replacing chromated pigments with effective non-hazardous alternatives.  TDA Research has developed new nanoparticle-based corrosion inhibitors that provide release-on-demand corrosion protection.  These corrosion inhibitor additives work by a patented design where the corrosion inhibitor is triggered to release by the corrosion process itself.  Thus, the inhibitors remain in the coating until needed and when corrosion occurs they release, migrate to the metal surface and arrest corrosion. This smart corrosion protection mechanism provides effective long-term corrosion protection without the use of chromate corrosion inhibitors.  In collaboration with Akzo Nobel Aerospace Coatings, and in support of a research program sponsored by NAVAIR, we are now completing a Phase II development project for the formulation of a nanoparticle based chromate-free coating to protect aircraft integral fuel tanks. This new chromate-free fuel tank coating gives excellent performance in salt fog (ASTM B-117), adhesion, and simulated microbial by-products tests.