腐蚀
材料科学
纳米尺度
金属间化合物
铝
合金
冶金
透射电子显微镜
再分配(选举)
制作
贵金属
纳米技术
金属
政治
病理
法学
替代医学
医学
政治学
作者
Ali Kosari,H.W. Zandbergen,F.D. Tichelaar,Peter Visser,Peyman Taheri,Herman Terryn,J.M.C. Mol
标识
DOI:10.1016/j.corsci.2020.108912
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.
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