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Electrochemical Impedance Spectroscopy (EIS) Analysis of Freshwater Foul-Release Coatings

Electrochemical Impedance Spectroscopy (EIS) Analysis of Freshwater Foul-Release Coatings
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Foul-release coating systems were examined by electrochemical impedance spectroscopy (EIS) to measure the degradation of coating dielectric properties in immersion. Three-inch by six-inch coated steel coupons were placed in dilute Harrison’s solution (DHS) to simulate constant immersion field conditions. 

Product Number: 41213-789-SG
Author: Bobbi Jo Merten, Allen Skaja, David Tordonato
Publication Date: 2013
Industries: Coatings , Corrosion Monitoring and Control
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Foul-release coating systems were examined by electrochemical impedance spectroscopy (EIS) to measure the degradation of coating dielectric properties in immersion. Three-inch by six-inch coated steel coupons were placed in dilute Harrison’s solution (DHS) to simulate constant immersion field conditions. This electrolyte concentration is higher than those observed in the field and serves to accelerate the degradation of the coating system. The experiment duration was two years. EIS is a powerful tool for investigating the evolution of a coating’s dielectric properties. There is some indication that it can be used to predict the estimated service life for a coating system. This has the potential to greatly improve cost efficiency when specifying new systems for use as foul-release industrial maintenance coatings. Reclamation requires fouling mitigation technologies for a variety of uses on their water and power infrastructure. Foul-release coating systems are one solution for this. Of the materials tested thus far, silicones have shown excellent field performance by preventing mussel attachment. The foul-release performance is compared to the results of EIS analysis. The study revealed that a few of the systems also have very high barrier protection—maintaining purely capacitive properties following two years in constant immersion. This is necessary to prevent corrosion of the underlying substrate while in service. The coatings were ranked to estimate their service life in regard to barrier protection and foul-release performance. Traditional two-component epoxy coating systems were utilized as an experimental control.

Foul-release coating systems were examined by electrochemical impedance spectroscopy (EIS) to measure the degradation of coating dielectric properties in immersion. Three-inch by six-inch coated steel coupons were placed in dilute Harrison’s solution (DHS) to simulate constant immersion field conditions. This electrolyte concentration is higher than those observed in the field and serves to accelerate the degradation of the coating system. The experiment duration was two years. EIS is a powerful tool for investigating the evolution of a coating’s dielectric properties. There is some indication that it can be used to predict the estimated service life for a coating system. This has the potential to greatly improve cost efficiency when specifying new systems for use as foul-release industrial maintenance coatings. Reclamation requires fouling mitigation technologies for a variety of uses on their water and power infrastructure. Foul-release coating systems are one solution for this. Of the materials tested thus far, silicones have shown excellent field performance by preventing mussel attachment. The foul-release performance is compared to the results of EIS analysis. The study revealed that a few of the systems also have very high barrier protection—maintaining purely capacitive properties following two years in constant immersion. This is necessary to prevent corrosion of the underlying substrate while in service. The coatings were ranked to estimate their service life in regard to barrier protection and foul-release performance. Traditional two-component epoxy coating systems were utilized as an experimental control.

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