Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy
Recent findings showed severe localized corrosion of submerged steel bridge piles in a Florida bridge and was associated with microbial activity in the presence of marine foulers. Microbiologically influenced corrosion (MIC) can cause severe degradation of submerged steel infrastructure with the pre...
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Online Access: | https://www.mdpi.com/2079-6412/9/8/518 |
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doaj-a8729a223edf43f4b2e9bdf608a9a52f2020-11-25T00:40:03ZengMDPI AGCoatings2079-64122019-08-019851810.3390/coatings9080518coatings9080518Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance SpectroscopySamanbar Permeh0Kingsley Lau1Matthew Duncan2Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USADepartment of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USAFlorida Department of Transportation, Gainesville, FL 32609, USARecent findings showed severe localized corrosion of submerged steel bridge piles in a Florida bridge and was associated with microbial activity in the presence of marine foulers. Microbiologically influenced corrosion (MIC) can cause severe degradation of submerged steel infrastructure with the presence of biofilm associated with microorganisms such as sulfate reducing bacteria (SRB). Coatings have been developed to mitigate MIC and marine fouling. Coating degradation and disbondment can occur as a result of microbial attack due to the production of metabolites that degrade coating chemical and physical properties. In the work described here, electrochemical impedance spectroscopy (EIS) was conducted to identify microbial activity and degradation of an antifouling coating exposed to SRB-inoculated modified Postgate B solution. The measurements resulted in complicated impedance with multiple loops in the Nyquist diagram associated with the coating material, development of surface layers (biofilm), and the steel interface. Deconvolution of the impedance results and fitting to equivalent circuit analogs were made to identify coating characteristics and surface layer formation. EIS test results revealed coating degradation and subsequent formation of surface layers associated with SRB due to coating self-polishing and depletion of biocide components.https://www.mdpi.com/2079-6412/9/8/518electrochemical impedance spectroscopycoatingbiofilm |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Samanbar Permeh Kingsley Lau Matthew Duncan |
spellingShingle |
Samanbar Permeh Kingsley Lau Matthew Duncan Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy Coatings electrochemical impedance spectroscopy coating biofilm |
author_facet |
Samanbar Permeh Kingsley Lau Matthew Duncan |
author_sort |
Samanbar Permeh |
title |
Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy |
title_short |
Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy |
title_full |
Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy |
title_fullStr |
Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy |
title_full_unstemmed |
Characterization of Biofilm Formation and Coating Degradation by Electrochemical Impedance Spectroscopy |
title_sort |
characterization of biofilm formation and coating degradation by electrochemical impedance spectroscopy |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2019-08-01 |
description |
Recent findings showed severe localized corrosion of submerged steel bridge piles in a Florida bridge and was associated with microbial activity in the presence of marine foulers. Microbiologically influenced corrosion (MIC) can cause severe degradation of submerged steel infrastructure with the presence of biofilm associated with microorganisms such as sulfate reducing bacteria (SRB). Coatings have been developed to mitigate MIC and marine fouling. Coating degradation and disbondment can occur as a result of microbial attack due to the production of metabolites that degrade coating chemical and physical properties. In the work described here, electrochemical impedance spectroscopy (EIS) was conducted to identify microbial activity and degradation of an antifouling coating exposed to SRB-inoculated modified Postgate B solution. The measurements resulted in complicated impedance with multiple loops in the Nyquist diagram associated with the coating material, development of surface layers (biofilm), and the steel interface. Deconvolution of the impedance results and fitting to equivalent circuit analogs were made to identify coating characteristics and surface layer formation. EIS test results revealed coating degradation and subsequent formation of surface layers associated with SRB due to coating self-polishing and depletion of biocide components. |
topic |
electrochemical impedance spectroscopy coating biofilm |
url |
https://www.mdpi.com/2079-6412/9/8/518 |
work_keys_str_mv |
AT samanbarpermeh characterizationofbiofilmformationandcoatingdegradationbyelectrochemicalimpedancespectroscopy AT kingsleylau characterizationofbiofilmformationandcoatingdegradationbyelectrochemicalimpedancespectroscopy AT matthewduncan characterizationofbiofilmformationandcoatingdegradationbyelectrochemicalimpedancespectroscopy |
_version_ |
1725291723675926528 |