Abstract
Surface films of AA2024-T3 after immersion in 0.1 M NaCl for 14 days, 6 months, and 1 year have been investigated using scanning electron microscopy. The corrosion product generated on the surface over the immersion period was comprised of porous outer and compact inner layers. The Cu enrichment at the corrosion product/metal interface and Cu clusters within the surface films have been observed. Exfoliation corrosion was observed, which allows the electrolyte to migrate through exfoliated path and cause rapid corrosion at sub-surface level. Mechanistic aspects of surface film, Cu cluster formation, and corrosion under the surface film have been discussed.
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