Intergranular attack (IG) and exfoliation corrosion (EC) have a detrimental impact on the structural integrity of aircraft structures\nof all types. Understanding the mechanisms and methods for dealing with these processes and with corrosion in general has been\nand is critical to the safety of critical components of aircraft. Discussion of cases where IG attack and exfoliation caused issues in\nstructural integrity in aircraft in operational fleets is presented herein along with a much more detailed presentation of the issues\ninvolved in dealing with corrosion of aircraft. Issues of corrosion and fatigue related to the structural integrity of aging aircraft are\nintroduced herein.Mechanisms of pitting nucleation are discussed which include adsorption-induced, ion migration-penetration,\nand chemicomechanical film breakdown theories. In addition, pitting corrosion (PC) fatigue models are presented as well as a\ncritical assessment of their application to aircraft structures and materials. Finally environmental effects on short crack behavior\nof materials are discussed, and a compilation of definitions related to corrosion and fatigue are presented.
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