Electrochemical behaviour of PANi/polyurethane antifouling coating in salt water studied by electrochemical impedance spectroscopy |
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| Affiliation: | 1. Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, Gent B-9000, Belgium;2. Department of Civil and Environmental Engineering, University of California at Berkeley, Berkeley, CA 94720, USA;3. BIOMED, University of Hasselt, Agoralaan Building C, Diepenbeek, Belgium;1. Department of Polymer Engineering, Golestan University, Gorgan, Iran;2. Iran Polymer and Petrochemical Institute, Tehran, Iran;3. Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran;4. Department of Chemistry, Golestan University, Gorgan, Iran;1. Department of Polymers and Pigments, National Research Center, 33 El Bohouth st. (former El Tahrir st.) Dokki, P.O. 12622, Giza, Egypt;2. Fraunhofer Institute for Manufacturing Engineering and Automation IPA, Coating Systems and Painting Technology, Allmandring 37, 70569 Stuttgart, Germany;1. Petroleum applications Department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt;2. Production Department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt;3. Environmental Researches Department, Theodor Bilharz Research Institute (TBRI), Giza, Egypt;4. Petrochemical Department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt |
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| Abstract: | Electrochemical behaviour of polyaniline–polyurethane (PANi–PU) antifouling coating in 3.5 wt% NaCl is studied by electrochemical impedance spectroscopy (EIS). A thick coating (～1 mm) of 10, 15 and 20% PANi in marine grade PU, is cast over corrosion resistant aluminium alloy 2024 and its impedance characteristics are measured by EIS and compared with neat PU. On addition of 10% PANi, the impedance of the coating drastically comes down from 109 to 107 Ω. 20% is the maximum processable amount of PANi for the selected PU system. The coatings are exposed to 3.5 wt% NaCl and its impedance characteristics are monitored as a function of time. Changes in the impedance characteristics of the systems were found to occur as a function of the exposure time in all cases, though their evolution with time showed marked differences with PANi content. Water sorption and break down frequency are derived from the experimental results and analysed. |
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| Keywords: | Electrochemical impedance spectroscopy Antifouling coating PANi |
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