Linear Polarization Resistance Sensor Using the Structure as a Working Electrode

Douglas W. Brown, Richard J. Connolly, Duane R. Darr, and Bernard Laskowski
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Full Paper
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Linear Polarization Resistance Flex Sensor Using Structure as Working Electrode
phmce_14_078.pdf474.59 KBMay 13, 2014 - 5:35pm

A direct method of measuring corrosion on a structure using a micro-linear polarization resistance (uLPR) sensor is presented. The sensor includes three electrodes, where each electrode is fabricated on a flexible substrate to create a circuit consisting of gold-plated copper. The first two electrodes are configured in an interdigitated fashion with a separation distance of 1mil. The flex cable contains porous dielectric material between the pair of electrodes and the structure. A third electrode is placed 10mm from the first two and makes electrical contact to the structure through a 1mil thick electrically conductive transfer tape placed between the electrode and structure. The flex cable can be attached to the structure through the use of adhesives or in the case of placement in a butt joint or lap joint configuration, by the joint itself. Corrosion is computed from known physical constants, by measuring the polarization resistance between the electrolytic solution and the structure. A controlled experiment using the ASTM G85 Annex 5 standard verifies the precision and accuracy of sensor measurements by comparing the estimated mass loss with witness coupons.

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Submission Keywords: 
structural health monitoring
Submission Topic Areas: 
Structural health monitoring
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