Effects of Microstructure of Aluminum Substrate on Ordered Nanopore Arrays in Anodic Alumina

doi:10.1016/j.jmst.2014.09.019

Abstract

Abstract: The effects of microstructure of aluminum substrate on regular nanopore arrangement in anodic alumina layer were investigated. The dissimilar microstructure and texture on aluminum sheets were prepared by various cold rollings and heat treatments, and anodic alumina nanoporous layers were fabricated by two step anodizing method at 40 V in oxalic acid solution. For the aluminum sheets with similar surface texture and annealing condition except purity, the regularity of the nanopore arrangement on the anodic alumina layer increased with purity of aluminum substrate. The difference of surface texture on Al sheets is not critical parameter for formation of ordered nanopore array compared with purity and heat treatment of substrate aluminum. The investigation suggested that the purity and reasonable annealing temperature of aluminum substrate are very important process to obtain the highly-ordered nanopore array on anodic alumina layer.

Key words: Anodization, Nanoporous structure, Texture, Aluminum alloy

Choong-Soo Chi, Jong-Ho Lee, Insoo Kim, Han-Jun Oh. Effects of Microstructure of Aluminum Substrate on Ordered Nanopore Arrays in Anodic Alumina[J]. J. Mater. Sci. Technol., 2015, 31(7): 751-758.

Figures/Tables 13

Process for preparing nanoporous anodic alumina layer.

Measured (220) pole figures: (a) cold-rolled AA1050 annealed at 200 °

C for 1 h (sample-1), (b) high pure Al (99.99%) annealed at 200 °

C for 1 h (sample-2), (c) AA1050 annealed at 200 °

C for 1 h (sample-3), (d) AA1050 annealed at 500 °

C for 1 h (sample-4), and (e) AA1050 annealed at 500 °

C for 1 h (sample-5).

ODFs of the (a) sample-1, (b) sample-2, (c) sample-3, (d) sample-4, (e) sample-5 and (f) the prominent orientations in Euler's space angel with constant PHI 2 section.

SEM images of upper and bottom view of 1st alumina layer: (a) upper and (c) bottom view for AA1050 substrate, (b) upper and (d) bottom view for pure Al (99.99%) substrate. Nanopore arrays of anodic alumina layer prepared by two-step anodization for (e) AA1050 and (f) pure Al (99.99%) substrate.

Inverse pole figures on (a, c) AA1050 and (b) pure aluminum substrates, which were cold rolled and annealed at 200 °

C for 1 h, and then the Al sheets were anodized using two-step anodization. The SEM images of nanopore structure fabricated with AA1050 (d, f) and pure aluminum (e) sheets.

Average nanopore domain diameter on anodic alumina layer formed on AA1050 and pure aluminum sheet.

Average nanopore domain diameter on anodic alumina layer formed at AA1050 sheet with different texture structure.

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