Legacy military protective coatings typically utilize chemistries, techniques and operational requirements involving significant regulatory, manpower and time impacts. Coating systems often use hazardous chemistries or processes during their application. Frequently, coating systems involve heavy metal laden chemistries, high organic lading that releases hazardous air pollutants, multiple layers and lengthy drying times, hazardous materials with resultant large quantities of costly and unsustainable hazardous wastes.
It is estimated that the military annually spends as much as $20B on weapon system corrosion prevention and control coatings. Current and legacy DoD cpc coating(s) fail to fully meet worldwide military protection requirements. These coating systems involve multiple compound processes and material systems where manufacturing, re-manufacturing, field and depot application, maintenance and removal techniques directly contribute to and significantly impact the military’s weapon system lifecycle costs and operational readiness.
High-performance DoD weapon system coatings frequently require chemical strippers, such as methylene chloride, or abrasive materials, such as plastic aggregate and mechanical sanders. Methylene chloride is inexpensive and effective at removing coatings, yet it is carcinogenic and generates significant amounts of hazardous waste. Aggregates are effective, yet require trained individuals, blasting/sanding equipment, specialized containments, and can also generate significant waste. More benign chemical strippers, such as peroxides, have recently been implemented by the DoD, yet these materials are less effective than methylene chloride and can generate even greater amounts of hazardous waste. More recently, laser ablation has been demonstrated as an alternative for coating removal, and although this method generates reduced quantities of waste, it is labor intensive, utilizes expensive equipment, and requires highly-trained individuals or robotics. None of these methods can selectively remove the polyurethane topcoat on aircraft without affecting the underlying epoxy primer, and it remains extremely difficult to remove coatings from an organic composite, such as carbon fiber-reinforced epoxies or polyesters, without potentially damaging the latter. As more composite skins are utilized on DoD assets, the inability to rapidly and selectively remove coatings will continue to be an issue.
The Weapons Systems and Platforms Program Area supports development of technologies and processes that are associated with the manufacture, operations, and maintenance of military equipment, weaponry, and munitions. These lifecycle stages of a system may impact workers, the environment, and surrounding communities. Increasing the sustainability of these systems offers opportunities to identify and manage these impacts to lower associated lifecycle costs and improve mission readiness. DoD’s Sustainability Analysis uses a lifecycle approach to evaluate potential impacts associated with costs, ecosystem quality, human health, and resource availability.