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51317--9547-Electrochemical Performance of Nano Engineered-Coatings Based on ANA in Corrosive Environment

Picture for Electrochemical Performance of Nano Engineered-Coatings Based on ANA in Corrosive Environment
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Utilization of electrochemical impedance spectroscopy as a characterization tool for antimicrobial nano alloy (ANA) as an epoxy filler in corrosive environments. Steel panels with two coating formulations having in common an ANA component were tested.

 

Product Number: 51317--9547-SG
ISBN: 9547 2017 CP
Author: Tse-Ming Chiu
Publication Date: 2017
Industry: Coatings and Linings
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$20.00

ABSTRACTThis work describes the use of electrochemical impedance spectroscopy as a characterization tool for nano-scale additive (ANA) as corrosion barriers in different corrosive environments. Steel panels with three different coating formulations having in common an ANA component were tested. The formulations included Al2O3 fusion bonded epoxy and marine coatings with different ANA percentages and were applied onto a steel panel by one horizontal and one vertical arc-spraying layer.The panels were exposed in 3.5% NaCl and characterized by using electrochemical impedance spectroscopy (EIS) and surface analysis. EIS shows the interfacial mechanism when the ANA concentration is modified and the barrier effect demonstrates the water uptake process while the charge transfer process demonstrates the dominant mechanism with time. The increase in the ANA percentage influences the impedance and the mechanisms in the coatings. This work presents the results for exposure period of 100 days and proposes the mechanisms based on electrochemical testing and localized surface analysis by using Scanning Vibrating Technique.Among these three different types of coatings the FBE group shows the highest polarization resistance during the testing period. This suggests that this provides the strongest barrier protection mechanism. The charge transfer or corrosion process is barely observed in the five samples which include the ANA addition. However an ANA addition of more than 30% does not improve the resistance properties as this might increase the porosity of the coatings.

Key words: antimicrobial nano-alloy, electrochemical impedance spectroscopy, microgalvanic corrosion

ABSTRACTThis work describes the use of electrochemical impedance spectroscopy as a characterization tool for nano-scale additive (ANA) as corrosion barriers in different corrosive environments. Steel panels with three different coating formulations having in common an ANA component were tested. The formulations included Al2O3 fusion bonded epoxy and marine coatings with different ANA percentages and were applied onto a steel panel by one horizontal and one vertical arc-spraying layer.The panels were exposed in 3.5% NaCl and characterized by using electrochemical impedance spectroscopy (EIS) and surface analysis. EIS shows the interfacial mechanism when the ANA concentration is modified and the barrier effect demonstrates the water uptake process while the charge transfer process demonstrates the dominant mechanism with time. The increase in the ANA percentage influences the impedance and the mechanisms in the coatings. This work presents the results for exposure period of 100 days and proposes the mechanisms based on electrochemical testing and localized surface analysis by using Scanning Vibrating Technique.Among these three different types of coatings the FBE group shows the highest polarization resistance during the testing period. This suggests that this provides the strongest barrier protection mechanism. The charge transfer or corrosion process is barely observed in the five samples which include the ANA addition. However an ANA addition of more than 30% does not improve the resistance properties as this might increase the porosity of the coatings.

Key words: antimicrobial nano-alloy, electrochemical impedance spectroscopy, microgalvanic corrosion

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