Corrosion measurement underneath coatings by holographic interferometry and other techniques

Khaled J. Habib; F. Al-Sabti

doi:10.1117/12.269806

20 March 1997 Corrosion measurement underneath coatings by holographic interferometry and other techniques

Khaled J. Habib, F. Al-Sabti

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269806
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

In a previous study, an optical corrosion-meter was built based on a mathematical model relating surface and bulk behaviors of metals in aqueous solution. The optical corrosion-meter was established based on principles of holographic interferometry for measuring microsurface dissolution, i.e. mass loss, and on those of electrochemistry for measuring the bulk electronic current, i.e. corrosion current. The corrosion-meter consists of an electrochemical cell in which the sample is immersed in aqueous solution. Furthermore, the corrosion-meter has a holographic camera with a thermoplastic film for in situ processing holograms in order to obtain real time-holographic interferoms of the sample in the electrochemical cell. Results of the present work indicate that optical holography is very useful technique for measuring the corrosion current density underneath coatings of different alloys in aqueous solutions. As a result, the corrosion current density of coated aluminum, low carbon steel, copper, and brass in 1 M KCl, 1M NaOH, seawater and seawater solutions, respectively, were obtained. The obtained corrosion data from the optical corrosion-meter (interferometric technique) were compared with corrosion data obtained on the same alloys in the specified solutions from the alternating current (AC) impedance spectroscopy with linear polarization, electrochemical techniques. The comparison among the two techniques indicates that there is contrast in the results among the investigated alloys. In general, the new method of optical interferometry can be considered more conservative method of corrosion measurement with respect to the alternating current (AC) impedance spectroscopy.

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Khaled J. Habib and F. Al-Sabti "Corrosion measurement underneath coatings by holographic interferometry and other techniques", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269806

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KEYWORDS

Corrosion

Dielectric spectroscopy

Holographic interferometry

Carbon

Optical coatings

Optical interferometry

Polarization

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