Abstract
Aluminum alloy 7075-T6 is used in aerospace applications as a result of its high strength-to-weight ratio, but this material is susceptible to localized corrosion in condensing atmospheric exposure conditions and is usually protected with an anti-corrosion coating system. CaSO4 is sometimes found as an extender component in corrosion inhibition primer pigment systems, such as commercial Pr-rich primer, which has been qualified for military use. The role CaSO4 might play in corrosion protection afforded by the coating system has not been addressed thoroughly in the scientific literature. The goal of this study was to isolate and characterize any inhibiting effect of CaSO4 on AA7075-T6 to understand how it might play a role in non-chromate primer coatings. Samples of AA7075-T6 were exposed to chloride solutions with varying pH via static immersion exposure with and without CaSO4 as an inhibitor for times ranging up to 30 d. The solution pH was varied from 3 to 10 and the chloride concentration was fixed at ...
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