GM 9540P Cyclic Accelerated Corrosion Analysis of Nonchromate Conversion Coatings on Aluminum Alloys 2024, 2219, 5083, and 7075 Using DOD Paint Systems
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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This study examines corrosion resistance of eight nonchromate conversion coatings versus hexavalent chromium based Alodine 1200 controls on scribed coated test panels of aluminum alloys 2024, 2219, 5083, and 7075. Five representative DOD primertopcoat organic coating systems were evaluated for each of the conversion coatingalloy combinations. Scribed panels were exposed using GM 9540P for 120 cycles duration and were photographed and measured at 20 cycle intermediate intervals for scribe creepback using method ASTM D 1654. Differences in pretreatment performance based upon variation in coating type as well as alloy were noted. How these data may relate with respect to implementation of nonchromate pretreatments for different military applications is discussed.
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys