Aluminum alloys when exposed to the atmosphere in contact with dissimilar metals are quite susceptible to corrosion. Their resistance further deteriorates if saline environments are present which presumably disrupt the protective oxide film on the metal surface and thus accelerate corrosion. This problem is of great concern to the aircraft industry, where dissimilar metal fasteners are used with aluminum alloys for the fabrication of airframes. Extensive damage has been reported on horizontal upper surfaces where salt deposits accumulate in the crevices between skin and fastener.

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