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• May 16, 2020 Create Date
• May 16, 2020 Last Updated

Two F-102 airplane wing access doors received from Naha, A.F.B., Okinawa about five years subsequent to manufacture were examined for corrosion damage incidence. The doors were made of clad 2024-T66 aluminum alloy and their exterior surfaces were originally treated with Alodine 600 (American Chemical Paint Co. ) chemical and coated with a baked Scotch weld primer, EC 1290 (Minnesota Mining and manufacturing Co.). Upon receipt, the EC 1290 primer was missing from interior surfaces accessible to fuel impingement. These areas exhibited corrosion pitting ranging 6 to 35 mils depth and 20 to 120 pits per door as a result of "general" corrosive attack which appeared to have been caused by marine atmosphere impingement. Examination revealed that the clad 2024-T86 aluminum alloy was normal with respect to inter granular corrosion susceptibility.