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In situ synchrotron X-ray tomography was used to monitor the development of corrosion in service-like conditions. Deliquescence of sodium chloride contaminants formed a droplet environment that caused intergranular corrosion in 2024-T351 and 7050-T7451 alloys. For the 2024 alloy, corrosion grew at comparable rates in the longitudinal and long-transverse directions. Initiation occurred at an intermetallic...