Innovative Coatings for Prevention of Inter-Granular Corrosion in Sensitized 5000 Series Aluminum Alloys

The objectives of proposal are to create effective and durable barrier and passivating coating that will satisfy all requirements of MIL-PRF-24647D(SH) and mitigate intergranular corrosion in sensitized 5000 series aluminum alloys, as well as to identify the best application techniques for such coating. POLYMERight plans to create the targeted coating by transferring its proven innovative approach to the development of effective marine anticorrosive coatings for steel to 5XXX series aluminum. The coating will have tri-pronged action: it will be a sensitization barrier for aluminum/magnesium alloys, it will passivate the surface of such alloys, and it will serve as impermeable barrier to moisture and ionic specimens that are typically present in marine environment and cause corrosion. POLYMERight will achieve the set goals by utilizing its innovative patented polysulfide-epoxy based chemistry that was already used in the creation of multiple successful primers and coatings with superior protection properties. Polysulfide-epoxies are very attractive choice as they have one of the lowest moisture and gas permeabilities among all polymers, excellent affinity to metals, outstanding chemical and environmental resistance and attractive tensile properties. New types of oxidative functional groups can be attached to the polymeric backbones and serve as passivating agents for aluminum.