The advanced corrosion resistant aircraft coatings program (ACRAC) is part of the Air Force strategy to improve performance and reduce environmental impact of coatings used on Air force weapon systems. The program addresses the Air Force near and mid-term-strategies to eliminate chromate corrosion inhibitors and reduce steps in the outer mold line coating process. Evaluation of the coating process (surface preparation, conversion coating, primer, topcoat) as a system is a key feature of the ACRAC program. Results to date indicate that the current-state-of-the-art nonchromated coating systems are significantly less effective than those with chromate. A chromate conversion coating is required for the nonchromate primer system to meet minimum requirements. Sol-gel process based conversion coatings can replace chromate conversion coatings provided a chromated primer is used. Several approaches to incorporating inhibitors into sol-gel coatings are discussed. Electrochemical methods for testing coating performance are discussed and a new procedure based on impedance spectroscopy for evaluating active damage repair is presented.
Testing and evaluation of nonchromated coating systems for aerospace applications
Prüfung und Bewertung von chromatfreien Beschichtungssystemen für Luftfahrtanwendungen
Progress in Organic Coatings. An International Journal ; 41 , 4 ; 217-225
2001
9 Seiten, 11 Bilder, 2 Tabellen, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
Militärflugzeug , Beschichtungsmittel , Beschichtung mit Kunststoff , Materialprüfung , Bewertung , Chromatieren , Konversionsbeschichten , Oberflächenvorbehandlung , Primer , Sol-Gel-Verfahren , Korrosionsschutz , elektrochemisches Verfahren , Impedanzspektrometrie , Korrosionsinhibitor , Forschungsprogramm , Umweltverträglichkeit
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