Accession Number : ADA185028

Title :   An Examination of Coating Failure on Wing Pivot Fittings of F111 Aircraft,

Corporate Author : MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)

Personal Author(s) : Wake, L V

PDF Url : ADA185028

Report Date : May 1987

Pagination or Media Count : 34

Abstract : Failure of replacement coatings on the wing pivot fittings in integral wing fuel tanks of F111 aircraft has resulted in serious corrosion and pitting on critical sections of the fittings. Failed paint flakes from the fittings were characterized by adhesive detachment of the epoxy polyamide priming coat. Examination of fuel and moisture resistance of a range of possible coatings has been undertaken against those currently in use. The results suggest that coatings based on epoxy polymide resins are sensitive to glycol ether compounds employed as fuel system icing inhibitors in aviation turbine fuels. A more resistant epoxy polyurethane paint coating has therefore been proposed for use on the inspection areas of the fittings. It is also recommended that respraying over existing coatings inside the wing fuel tanks and on the fittings away from the inspection areas, a practice that has led to a series of intercoat adhesion failures following overhaul, be discontinued. (Author)

Descriptors :   *EPOXY COATINGS, *CORROSION RESISTANCE, WINGS, PIVOTS, FITTINGS, FUEL TANKS, PITTING, AUSTRALIA

Subject Categories : Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE