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

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)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1987
Accession Number
ADA185028

Entities

People

  • L. V. Wake

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Adhesion
  • Aircrafts
  • Biomedical And Dental Materials
  • Chemical Analysis
  • Chemical Synthesis
  • Chemistry
  • Chromium Compounds
  • Fuel Systems
  • Fuel Tanks
  • Mass Spectrometry
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Organic Chemistry
  • Polymeric Films
  • Resins
  • Resistance

Readers

  • Petroleum Engineering
  • Structural Health Monitoring of Composite Structures.
  • Surface Coatings Technology.