FIB/SEM study of AA2024 corrosion under a seawater drop, part II
2011; Elsevier BV; Volume: 55; Linguagem: Inglês
10.1016/j.corsci.2011.10.012
ISSN1879-0496
AutoresPeter C. King, Ivan Cole, P. Corrigan, A.E. Hughés, Tim H. Muster, S. Thomas,
Tópico(s)Corrosion Behavior and Inhibition
ResumoThe dissolution of S-phase clusters in aluminium alloy 2024 (AA2024) exposed to a 0.5 μl seawater droplet is presented. Foils for transmission electron microscopy (TEM) were made from local attack sites using a focussed ion beam/scanning electron microscope (FIB/SEM). The sections showed that clusters of S-phase particles underwent dealloying. The resulting copper sponge morphology, banding, preferred orientation and crystal defect structure as a result of plastic deformation have been characterised. With build-up of amorphous corrosion product, physical and electrical isolation of parts of the clusters developed, with the result of copper dissolution from the S-phase remnants.
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