Journal
CORROSION SCIENCE
Volume 181, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109221
Keywords
Aluminum; Anodic film; Sealing; TEM; SEM; XPS
Funding
- Japan Society for the Promotion of Science [20241026, 25289263]
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The process of hot water sealing of anodic alumina films was investigated, revealing that as sealing time increases, the quantity and size of boehmite flakes within the films also increase, ultimately forming a three-layered structure.
The mechanism of the hot water sealing of anodic alumina films was studied using electron microscopy and compositional analysis. The films dissolve in boiling water and boehmite precipitates as small flakes due to (100)-oriented growth with 3-nm average thickness and evenly dispersing in the pores and the surface. The quantity and size of flakes increase with increasing sealing time forming a densely intertwined boehmite structure. Eventually, a three-layered structure is formed, which is composed of an outer vertically grown coarse flaky layer, an intermediate dense flaky layer with 2:1 thickness ratio, and a porous layer filled with dense flaky boehmite.
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