Novel Epoxy Lacquer for High Strength Steel in F-111 Aircraft during Overhaul

摘要

The corrosion inhibiting paint used on high strength steel (D6AC) components ofRAAF F-111 aircraft is removed from the wing carry thru box and lower trap tank during deseal/reseal of integral fuel tanks and from the fuel flow holes and stiffener runouts during crack inspection of the wing pivot fittings. Following paint removal, a protective lubricant is applied to the exposed components during overhaul to inhibit corrosion and pitting of the D6AC steel. Adhesive paint failures have subsequently occurred following recoating of this steel in a number of F-111 aircraft as a result of incomplete removal of the lubricant. This report describes the development of an alternative temporary corrosion prevention coating to replace the protective grease. The replacement coating is an inhibited uncured epoxy resin system which is smear resistant, solvent removable and chemically compatible with the D6AC protective coating. Coating problems associated with the overhaul procedures are no longer being experienced since introduction of the epoxy lacquer into service by RAAF.