Engineering and Technology

Nanoscopic and in-situ cross-sectional observations of Li-based conversion coating formation using liquid-phase TEM

A. Kosari, F. Tichelaar, et al.

This research, conducted by A. Kosari, F. Tichelaar, P. Visser, P. Taheri, H. Zandbergen, H. Terryn, and J. M. C. Mol, utilizes liquid-phase transmission electron microscopy to unveil the intricate steps of lithium-based conversion coatings on aluminum. Discover a revolutionary approach that reveals a fascinating multi-stage process of surface transformation.

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Abstract

This study uses liquid-phase transmission electron microscopy (LP-TEM) to observe the nanoscopic morphological evolution of lithium-based conversion coatings on AA2024-T3 aluminum alloy. A novel specimen preparation method involving sandwiched thin lamellae allows for cross-sectional in-situ observation of the conversion process. The results reveal a multi-stage process beginning with uniform alloy dissolution, followed by needle-like precipitation at grain boundaries, and culminating in a multi-layered structure comprising columnar, porous, and dense sublayers. Ex-situ SEM and TEM analyses support the LP-TEM findings. This approach offers a powerful tool for studying complex surface conversion processes.

Publisher

npj Materials Degradation

Published On

Aug 05, 2021

Authors

A. Kosari, F. Tichelaar, P. Visser, P. Taheri, H. Zandbergen, H. Terryn, J. M. C. Mol

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