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In-situ nanoscopic observations of dealloying-driven local corrosion from surface initiation to in-depth propagation

Tijdschriftbijdrage - Tijdschriftartikel

Dealloying is involved in materials science responsible for fabrication of nanoscale structures beneficially but for corrosion degradations detrimentally. Detailed understanding related to the latter is critical for designing corrosion-resistance alloys and dedicated inhibition systems. Thus, direct nanoscopic observations of nano-structural and compositional evolutions during the process are essential. Here using liquid phase-transmission electron microscopy (LP-TEM), for the first time, we show dynamic evolution of intricate site-specific local corrosion linked to intermetallic particles (IMPs) in aerospace aluminium alloys. To thoroughly probe degradation events, oxidation direction is controlled by purposefully masking thin specimens, allowing for observing top-view surface initiation to cross-sectional depth propagation of local degradations. Real-time capturing validated and supported by post-mortem examinations shows a dealloying-driven process that initiates at IMPs and penetrates into the depth of the alloy, establishing macroscopic corrosion pits. Besides, controversial mechanisms of noble-metal redistribution are finally elucidated.

Tijdschrift: Corrosion Science
ISSN: 0010-938X
Volume: 177
Jaar van publicatie:2020
Trefwoorden:Aerospace aluminium alloys, Copper redistribution, Dealloying, In-situ liquid-phase TEM, Pitting corrosion