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Effect of sealing on the morphology of anodized aluminum oxide

Author:
Hu, Naiping   Dong, Xuecheng   He, Xueying   Browning, James F.   Schaefer, Dale W.  


Journal:
Corrosion Science


Issue Date:
2015


Abstract(summary):

Highlights

We explored structural change of anodizing aluminum oxide induced by sealing.

All sealing methods decrease pore size as shown by X-ray/neutron scattering.

Cold sealing and hot water sealing do not alter the aluminum oxide framework.

Hot nickel acetate sealing both fills the pores and deposits on air oxide interface.

Samples with hot nickel acetate sealing outperform other sealing methods.

Abstract

Ultra-small angle X-ray scattering (USAXS), small-angle neutron scattering (SANS), X-ray reflectometry (XRR) and neutron reflectometry (NR) were used to probe structure evolution induced by sealing of anodized aluminum. While cold nickel acetate sealing and hot-water sealing decrease pore size, these methods do not alter the cylindrical porous framework of the anodic aluminum oxide layer. Hot nickel acetate both fills the pores and deposits on the air surface (air–oxide interface), leading to low porosity and small mean pore radius (39 Å). Electrochemical impedance spectroscopy and direct current polarization show that samples sealed by hot nickel acetate outperform samples sealed by other sealing methods.



Page:
17-24


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