Chrome-Free Room Temperature Curing Fuel Tank Coating

In this Phase II proposal we have outlined a technical program to develop a hexavalent chrome free, room temperature curing fuel tank coating, which will meet or surpass the requirements of AMS-C-27725A. During Phase I we demonstrated that the non-chrome pigment and resin system candidates were capable of meeting the key fluid resistance and corrosion resistance requirements of AMS-C-27725A. In Phase II, the better formulations identified in Phase I will undergo all the tests required in the specification as well as a number of additional requirements particular to the Joint Strike Fighter fuel tank system: corrosion resistance to SO2-salt spray, galvanic corrosion resistance, and adhesion to graphite/epoxy composite. Formulation work will be undertaken to address deficiencies found in this full test battery. Production batches are planned for the final formula down-selected to provide material for verification testing and sampling for field trials. The final formula will be submitted to qualification testing to AMS-C-27725A.