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Diagnostic of Antifouling Coating Durability after Exposure in Natural Waters by Electrochemical Impedance Spectroscopy

Coatings are applied to steel elements exposed in natural waters to mitigate the deleterious effects of naturally occurring physical-, chemical-, and biodegradation processes. Degradation of steel submerged in natural waters can occur due to corrosion and marine fouling. Recent findings indicated that there are synergistic effects of surface fouling to facilitate biocorrosion.

Product Number: 51220-272-SG
Author: Samanbar Permeh, Kingsley Lau, Mayren Echeverria Boan, Matthew Duncan
Publication Date: 2020
Industry: Coatings
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$20.00
$20.00

Coatings are applied to steel elements exposed in natural waters to mitigate the deleterious effects of naturally occurring physical-, chemical-, and biodegradation processes. Degradation of steel submerged in natural waters can occur due to corrosion and marine fouling. Recent findings indicated that there are synergistic effects of surface fouling to facilitate biocorrosion. Steel bridge piles in a Florida bridge showed severe localized corrosion that was associated with microbial activity under the marine fouling organisms. Antifouling coatings have characteristics (ie anti-microbial, anti-fouling, and barrier) that can mitigate the degradation. Previous laboratory studies on antifouling coated steel coupons in solution inoculated with sulfate-reducing bacteria (SRB) showed degradation of the topcoat of the antifouling coating due to its self-polishing characteristics. In the research described here, the application of electrochemical impedance spectroscopy (EIS) was utilized to identify the performance of a commercially available anti-fouling coating exposed in three remote field test sites for ~200 days. The results showed that mitigation of fouling was afforded by the antifouling coating in comparison to non-coated surfaces; however, complete prevention of fouling was not attained. EIS showed that the degradation of the coatings at sites I and II allowed for reduced efficacy of coating biocides resulting in impedance associated with the formation of biofilm. Coating maintenance would be appropriate for prolonged use.

Coatings are applied to steel elements exposed in natural waters to mitigate the deleterious effects of naturally occurring physical-, chemical-, and biodegradation processes. Degradation of steel submerged in natural waters can occur due to corrosion and marine fouling. Recent findings indicated that there are synergistic effects of surface fouling to facilitate biocorrosion. Steel bridge piles in a Florida bridge showed severe localized corrosion that was associated with microbial activity under the marine fouling organisms. Antifouling coatings have characteristics (ie anti-microbial, anti-fouling, and barrier) that can mitigate the degradation. Previous laboratory studies on antifouling coated steel coupons in solution inoculated with sulfate-reducing bacteria (SRB) showed degradation of the topcoat of the antifouling coating due to its self-polishing characteristics. In the research described here, the application of electrochemical impedance spectroscopy (EIS) was utilized to identify the performance of a commercially available anti-fouling coating exposed in three remote field test sites for ~200 days. The results showed that mitigation of fouling was afforded by the antifouling coating in comparison to non-coated surfaces; however, complete prevention of fouling was not attained. EIS showed that the degradation of the coatings at sites I and II allowed for reduced efficacy of coating biocides resulting in impedance associated with the formation of biofilm. Coating maintenance would be appropriate for prolonged use.

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