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

被引:83
作者
Kosari, A. [1 ]
Zandbergen, H. [2 ]
Tichelaar, F. [2 ]
Visser, P. [3 ]
Taheri, P. [1 ]
Terryn, H. [4 ]
Mol, J. M. C. [1 ]
机构
[1] Delft Univ Technol, Dept Mat Sci & Engn, Mekelweg 2, NL-2628 CD Delft, Netherlands
[2] Delft Univ Technol, Kavli Inst Nanosci, Lorentzweg 1, NL-2628 CJ Delft, Netherlands
[3] AkzoNobel, Rijksstraatweg 31, NL-2171 AJ Sassenheim, Netherlands
[4] Vrije Univ Brussel, Dept Mat & Chem, Res Grp Electrochem & Surface Engn SURF, Pl Laan 2, B-1050 Brussels, Belgium
关键词
Aerospace aluminium alloys; In-situ liquid-phase TEM; Dealloying; Pitting corrosion; Copper redistribution;
D O I
10.1016/j.corsci.2020.108912
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页数:12
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