Organo-Aluminate Polymeric Materials as Advanced Erosion/Corrosion Resistant Thin Film Coatings.
Abstract
The primary goal of the DARPA program is the development of carboxylato-alumoxane based coating systems for repair and maintenance of DoD aircraft coatings. The proposed coating systems can potentially offer improved durability and corrosion protection, while avoiding the use of chromates and minimizing the emissions of both volatile organic compounds (VOCs) and hazardous air pollutants (HAPs). The coating system is based on the development of carboxylato- alumoxane precursors for fabrication of corrosion resistant oxide barrier layers and alumoxane-epoxy based primer coats. Carboxylato-alumoxanes are low-cost nanocomposite materials prepared from the reaction of carboxylic acids and the mineral boehmite (AlOOH), ^1/lb). The carboxylic acids are bound to the surfaces of the boehmite particles. The alumoxanes can be directly bonded into polymer matrices by the use of carboxylic acids that have the appropriate functional groups (i.e. -OH, -NH2, etc). The bonding of the particles to the polymer matrix reduces the voids inherent in filled polymers at the interface of hydrophilic fillers and hydrophobic polymers. The 'filled' alumoxane-epoxies potentially offer better barrier properties and improved mechanical properties over current epoxy corrosion coatings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1997
- Accession Number
- ADA326701
Entities
People
- Andrew R. Barron
- Harlan Anderson
- James O. Stoffer
- Ronald L. Cook