Determination of oxide barrier-film thickness of anodized aluminum by electrochemical impedance spectroscopy at the nanometer scale

K. Habib

doi:10.1117/12.861960

19 May 2010 Determination of oxide barrier-film thickness of anodized aluminum by electrochemical impedance spectroscopy at the nanometer scale

K. Habib

Author Affiliations +

Proceedings Volume 7743, Southeast Asian International Advances in Micro/Nanotechnology; 774304 (2010) https://doi.org/10.1117/12.861960
Event: Southeast Asian International Advances in Micro/Nano-technology, 2010, Bangkok, Thailand

Abstract

In this study, the effect of the annealing treatment on electrochemical behavior and the oxide barrier-film thickness of anodized aluminum-magnesium (Al-Mg) alloy was investigated. Electrochemical parameters such as the polarization resistance (RP), solution resistance (RSol), alternating current impedance (Z), and the double layer capacitance (C_dL) of the anodized Al-Mg alloy were determined in sulfuric acid solutions ranged from 0-10% H₂SO₄ by electrochemical impedance spectroscopy (EIS) methods. Then, the oxide film thickness of the anodized Al-Mg alloy was determined from the obtained electrochemical parameters as a function of the sulfuric acid concentration (0-10% H₂SO₄), in the as received sample and annealed sample conditions. The optimum thickness of the oxide film was determined for the as received samples (4.2nm) and for the annealed samples (0.63nm) in sulfuric acid concentrations of 4% and 2% H2SO4, respectively. The reason behind the oxide film thickness of the as received samples is greater than the one for the annealed samples, because the former samples are thermodynamically unstable (more chemically active) as compared to the annealed samples. A mathematical model was developed to interpret the mechanism of the oxide film build up on the aluminum substrate. The mathematical model of the oxide film build up on the aluminum substrate was proposed for the next challenge of the present work.

Citation Download Citation

K. Habib "Determination of oxide barrier-film thickness of anodized aluminum by electrochemical impedance spectroscopy at the nanometer scale", Proc. SPIE 7743, Southeast Asian International Advances in Micro/Nanotechnology, 774304 (19 May 2010); https://doi.org/10.1117/12.861960

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