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| Naji, M. |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kočí, Jan | Prague |
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| Azam, Siraj |
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| Azevedo, Nuno Monteiro |
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Wirtz, T.
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Publications (4/4 displayed)
- 2021Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantationcitations
- 2020Cross-sectional characterization of the conversion layer formed on AA2024-T3 by a lithium-leaching coatingcitations
- 2020Cross-sectional characterization of the conversion layer formed on AA2024-T3 by a lithium-leaching coatingcitations
- 2016Phase separation in NiCrN coatings induced by N2addition in the gasphase: A way to generate magnetic thin films by reactive sputtering ofa non-magnetic NiCr targetcitations
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article
Cross-sectional characterization of the conversion layer formed on AA2024-T3 by a lithium-leaching coating
Abstract
<p>This work focuses on the cross-sectional characterization of the protective conversion layer formed on AA2024-T3 by lithium-leaching from a polyurethane coating in a corrosive environment. The layer shows a multi-layered arrangement comprising nanoscopic local phases. Transmission electron microscopy (TEM) and complementary high-resolution secondary ion mass spectroscopy (SIMS) were employed to observe the cross-sections of the entire layer formed at different locations of a 1-mm-wide scribe, in terms of morphology, structure and chemical composition. The conversion layer was comprised of two ubiquitous sublayers; a thin dense layer (i.e. 150 nm) adjacent the alloy substrate and a porous layer. The former represents an amorphous lithium-containing pseudoboehmite phase, Li-pseudoboehmite, whereas the latter is composed of amorphous and crystalline products; an outer columnar layer merely seen on the peripheral region is also crystalline. Through a sandwich structure and the d<sub>(003)</sub> basal spacing, the crystalline phases were identified as Li-Al layered double hydroxide. Although lithium was found uniformly spread within different regions, the local phases with no/low concentration of lithium were revealed with energy filtered TEM and confirmed with SIMS analysis.</p>