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Methodology for Coated Infrastructure Inspection by Mobile Potentiostat

Methodology for Coated Infrastructure Inspection by Mobile Potentiostat
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A test methodology is shown for field application of electrochemical impedance spectroscopy (EIS). The method utilizes low-cost, accessible materials to secure a temporary solution cell to the infrastructure’s coated surface. A laptop computer provides the power source and operating system for the mobile potentiostat during EIS data collection. This data provides a quantitative measure of the coating condition. The objective of this work is to incorporate EIS testing into standard coatings inspection to estimate remaining service life for the intact coating, which improves coatings maintenance planning for facility owners. 

Product Number: 41215-912-SG
Author: Bobbi Jo Merten, Susan Drozdz, Cassidy Gills, David Tordonato, Jeff Ryan
Publication Date: 2015
Industries: Test Method , Coatings , Coatings and Linings
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$20.00
$20.00

A test methodology is shown for field application of electrochemical impedance spectroscopy (EIS). The method utilizes low-cost, accessible materials to secure a temporary solution cell to the infrastructure’s coated surface. A laptop computer provides the power source and operating system for the mobile potentiostat during EIS data collection. This data provides a quantitative measure of the coating condition. The objective of this work is to incorporate EIS testing into standard coatings inspection to estimate remaining service life for the intact coating, which improves coatings maintenance planning for facility owners. The first field demonstrations took place at U.S. Army Corps of Engineers projects at OzarkJeta Taylor Lock and Dam and Wilbur D. Mills Lock and Dam along the Arkansas River. Tainter gate structures containing a three-coat vinyl system provided optimal conditions for EIS data collection. These results were compared to laboratory EIS data for vinyl coatings to estimate the remaining coating service life. An atmospheric red lead primer with Aluminum phenolic topcoat was also tested to demonstrate the method. This paper focuses on the most ideal circumstances for setting up and completing EIS testing in a single inspection. Variables to consider include coating type, exposure conditions, saturation level, access, and surface geometry/orientation. The mitigation of potential noise sources is also addressed to ensure accurate data and interpretation.

A test methodology is shown for field application of electrochemical impedance spectroscopy (EIS). The method utilizes low-cost, accessible materials to secure a temporary solution cell to the infrastructure’s coated surface. A laptop computer provides the power source and operating system for the mobile potentiostat during EIS data collection. This data provides a quantitative measure of the coating condition. The objective of this work is to incorporate EIS testing into standard coatings inspection to estimate remaining service life for the intact coating, which improves coatings maintenance planning for facility owners. The first field demonstrations took place at U.S. Army Corps of Engineers projects at OzarkJeta Taylor Lock and Dam and Wilbur D. Mills Lock and Dam along the Arkansas River. Tainter gate structures containing a three-coat vinyl system provided optimal conditions for EIS data collection. These results were compared to laboratory EIS data for vinyl coatings to estimate the remaining coating service life. An atmospheric red lead primer with Aluminum phenolic topcoat was also tested to demonstrate the method. This paper focuses on the most ideal circumstances for setting up and completing EIS testing in a single inspection. Variables to consider include coating type, exposure conditions, saturation level, access, and surface geometry/orientation. The mitigation of potential noise sources is also addressed to ensure accurate data and interpretation.

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