AVS 45th International Symposium
    Vacuum Metallurgy Division Monday Sessions
       Session VM-MoA

Paper VM-MoA9
An XPS Study of the Effects of Chemical Pre-Cleaning of Aluminum Alloys on the Anti-Corrosion Properties of Plasma Deposited Films

Monday, November 2, 1998, 4:40 pm, Room 328

Session: Plasma Assisted Surface Treatments and Coatings
Presenter: C.E. Moffitt, University of Missouri, Kansas City
Authors: C.E. Moffitt, University of Missouri, Kansas City
D.M. Wieliczka, University of Missouri, Kansas City
H.K. Yasuda, University of Missouri, Columbia
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DC-plasma deposited films are showing great promise as an alternative to chromate conversion for enhanced coating adhesion and corrosion protection of the aircraft alloys AA2024 and AA7075. The oxide structure of these alloys is usually modified by chemical treatments prior to application of corrosion resistant coatings. The effects of cleaning with certain chemistries employed in industry were investigated with XPS sputter depth profiling. This study of the remaining oxide layer indicates that the cleaning process leaves some undesirable deposits on the surface, which affect the stability of the coating/alloy interface region during corrosive attack. The XPS depth profiles reveal the extent of the changes in alloy surface composition after cleaning. Depth profiles of plasma film coatings on alloy surfaces treated with specific chemistries are also presented. This work was supported under Air Force contract AF F33615-96-C-5055.