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
Technical Report,01 Jul 2012,01 Jul 2013
Army Research Laboratory Aberdeen Proving Ground United States
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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 B11790. 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 DefenseDOD systems including AA2027-T351, AA2027-T851, AA7017-T651, AA7017-T7651, AA7056-T7351, and AA7056-T7651were 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.
- Properties of Metals and Alloys