General Corrosion Resistance Assessments of AA7085, AA7129, and Other High-Performance Aluminum Alloys for Department of Defense (DOD) Systems Using Laboratory Based Accelerated Corrosion Methods and Electrochemistry.

Report No. ARL-TR-6690
Authors: Theresa A. Dillon; Elizabeth A. Charleton; Joseph P. Labukas; Brian E. Placzankis
Date/Pages: September 2013; 37 pages
Abstract: General corrosion assessments were conducted on currently used Military Specification (MILSPEC) grade aluminum alloys: AA7085-T711, AA7085-T721, and extruded AA7129-T5 in accelerated corrosion test chambers using ASTM B 117 Neutral Salt Fog (NSF) (ASTM B117—90. Standard Method of Salt Spray (Fog) Testing. Annu. Book ASTM Stand. 1990) and General Motors Standard 9540P (GM 9540P) (GM 9540P. Accelerated Corrosion Test, General Motors Engineering Standards, 1997) cyclic accelerated corrosion methods. Additional alloys proposed for possible future transitions to Department of Defense (DOD) systems—including AA2027-T351, AA2027-T851, AA7017-T651, AA7017-T7651, AA7056-T7351, and AA7056-T7651—were also evaluated. The NSF specimens were evaluated at 18-, 72-, and 168-hour (h) intervals. The GM 9540P specimens were examined at 1-, 5-, and 10-cycle intervals. Electrochemical evaluations of corrosion susceptibility for each of the alloys were performed using potentiodynamic polarization. The relative susceptibilities to general corrosion attack in comparison to current MILSPEC alloys and within their respective alloy series are discussed.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2013