Measurement of surface resistivity/conductivity of anodized aluminium alloy by optical interferometry techniques

K. Habib

doi:10.1117/12.848684

8 April 2010 Measurement of surface resistivity/conductivity of anodized aluminium alloy by optical interferometry techniques

K. Habib

Author Affiliations +

Proceedings Volume 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010; 764922 (2010) https://doi.org/10.1117/12.848684
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Optical interferometry techniques was used for the first time to measure the surface resistivity/conductivity of anodized aluminium samples in aqueous solution without any physical contact. The anodization process (oxidation) of the aluminium samples was carried out in different sulphuric acid solutions (1.0-2.5 % H₂SO₄), by the technique of electrochemical impedance spectroscopy (EIS), at room temperature. In the mean time, the real-time holographic interferometric was carried out to measure the thickness of anodized (oxide) film of the aluminium samples during the anodization processes. Then, the alternating current (AC) impedance (resistance) of the anodized aluminium samples was determined by the technique of electrochemical impedance spectroscopy (EIS) in different sulphuric acid solutions (1.0-2.5 % H₂SO₄) at room temperature. In addition, a mathematical model was derived in order to correlate between the AC impedance (resistance) and to the surface (orthogonal) displacement of the samples in solutions. In other words, a proportionality constant (surface resistivity or conductivity=1/ surface resistivity) between the determined AC impedance (by EIS technique) and the orthogonal displacement (by the optical interferometry techniques) was obtained. Consequently the surface resistivity (ρ) and conductivity (σ) of the aluminum samples in solutions were obtained. Also, electrical resistivity values (ρ) from other source were used for comparison sake with the calculated values of this investigation. This study revealed that the measured value of the resistivity for the anodized aluminium samples were 2.8×10⁹, 7×10¹², 2.5×10¹³, and 1.4 ×10¹² Ohms-cm in 1.0%,1.5%, 2.0%, and 2.5 % H₂SO₄ solutions, respectively. In fact, the determined value range of the resistivity is in a good agreement with the one found in literature for the aluminium oxide ,85% Al₂O₃ (5×10¹⁰ Ohms-cm in air at temperature 30C°), 96% Al₂O₃ (1×10¹⁴ Ohms-cm in air at temperature 30C°), and 99.7% Al₂O₃ (>1×10¹⁴ Ohmscm in air at temperature 30C°).

Citation Download Citation

K. Habib "Measurement of surface resistivity/conductivity of anodized aluminium alloy by optical interferometry techniques", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 764922 (8 April 2010); https://doi.org/10.1117/12.848684

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available