A major goal of the National Aging Aircraft Research Program (NAARP) is to provide the FAA and the aviation industry with analytical tools, predictive capabilities, sound practices and new methodologies to ensure structural integrity in aging aircraft, including corrosion control and prevention. In the paper the results of a two phase study are reported, first, to determine what corrosion prevention and control products (CPCP's) are being used by commuter and general aviation operators, and second, to obtain a quantitative measure of their effectiveness. Surveys to collect corrosion prevention and control information were mailed to the membership of the National Air Transportation Association (NATA), and the results of the survey were used to determine what CPCP's were to be tested. Three classifications of product type were identified: water displacing hard films, water displacing soft films and non water displacing soft films. Using aircraft grade 2024 T-3 and 7075 T-6 aluminum, the ten most reportedly used CPCP's were tested in accordance to ASTM Standard B-117. Each product was tested three separate times, using two samples of each aluminum alloy for each test. After exposure, the corrosion rate for each sample was determined and reported in terms of mils per year. For the products tested, corrosion rates ranged from the order of 0.01 to 5.0 mils per year (mpy). No direct correlation was found between product classification type and corrosion rate, however, the measured rates of corrosion does correlate with CPC viscosity. Products with a comparatively high viscosity exhibited the best protection, but were more difficult to apply. The lower viscosity CPCP's were easier to apply, but more readily removed during salt fog exposure.
Accelerated corrosion test method for painted aluminum structures
1999
13 Seiten, 14 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
Luftfahrzeug , Aluminiumlegierung , Altern (Werkstoff) , Korrosion , Korrosionsfestigkeit , Korrosionsschutzmittel , Korrosionsschutzschicht , Korrosionsversuch , Viskosität , Anwendbarkeit , Korrosionsgeschwindigkeit , Schutzüberzug , Richtlinie , Salzsprühprüfung , Korrosionshemmer , Vergleichsprüfung
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