Since pure aluminum has only moderate strength, aluminum alloys are used for aerospace and other structural applications.  However, copper in these alloys significantly reduces the corrosion resistance of the aluminum.  The standard surface pretreatment used to prepare the aerospace aluminum alloys for painting and insure good adhesion actually makes the problem worse.   Standard surface cleaning pretreatments causes dissolution, redistribution and enrichment of copper on the aluminum metal surfaces.  These copper enriched areas initiate the corrosion process because they support rapid oxygen reduction.  The migration away from chromate conversion coatings and chromated primers further puts more stress on the overall system performance.  Therefore, the development of new aluminum cleaning products which reduce copper dissolution and redeposition is critical to reducing the corrosion of aerospace aluminum alloys and decreasing maintenance costs.  TDA Research, Inc. (TDA) is developing an improved surface treatment cleaners that incorporate additives to inhibit copper dissolution and prevent ionized copper from redepositing on the aluminum surface.  These improved cleaners enhances the corrosion resistance of the copper-aluminum alloys.