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Demonstration and validation of portable electrochemical impedance spectroscopy technology : final report on Project F11-AR08

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Olaes, Christopher
Lampo, R. (Richard)
Clark, Lawrence
Drozdz, Susan A.
Ryan, Jeffrey P.

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Construction Engineering Research Laboratory (U.S.)
Engineer Research and Development Center (U.S.)


The Department of Defense maintains many steel structures that are subject to corrosion. Coatings are a traditional first line of defense against corrosion, but a completely accurate assessment of coating condition cannot always be made by using only conventional visual inspection techniques because not all defects are visible. Alternatively, performing laboratory inspections can be difficult, time-consuming, costly, and may require testing specimens separately from the actual coated structure. This Office of the Secretary of Defense Corrosion Prevention and Control Program project sought to improve accuracy and lower costs (early detection of problems reduce future maintenance) by demonstrating and validating the capabilities of a portable electrochemical impedance spectroscopy (EIS) technology for evaluating coating health. A portable EIS system was demonstrated in a laboratory setting and at field locations on Fort Bragg, NC, and Fort Lewis, WA. The results showed the tested version of the portable EIS system has limited capabilities in comparison to traditional laboratory methods. Based on the results of the technology demonstration, the system needs further development before the anticipated benefits might be realized. Therefore, widespread implementation of the demonstrated system is not recommended at the current state, and the project’s return on investment is considered to be zero.


Technical Report


Military bases--Maintenance and repair, Steel--Corrosion, Corrosion and anti-corrosives, Protective coatings, Impedance spectroscopy



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