Mechanistic Study of Fungi Degradation of Organic Coatings Used in Aircraft Finishing Systems
Technical Report,01 Mar 2018,30 Apr 2019
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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Navy and Marine Corps aircraft operate around the world, most often in hot, humid environments where fungi such as mold and mildew spores attach and proliferate in regions of the aircraft without sunlightultraviolet light exposure. Chemicals and materials such as hydraulic fluids, corrosion prevention compounds, atmospheric contaminants, and organic coatings act as a feedstock for microbes which leave by-products of organic acids, esterases, and lipases which are destructive to some coatings, corrosive to aluminum alloys, and can lead to human health concerns. This report investigated the role of the following factors a two common topcoats with differing characteristics, b the corrosion inhibitor and topography of chromated vs. non-chromated primers, c hydraulic fluid contamination, and d applied corrosion prevention compounds formulated with and without a fungistat. Multiple analytical techniques were used to characterize species proliferating for each test condition, the degree of attachment to coatings surfaces before and after cleaningsanitizing techniques, and incipient coating degradation.