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Evaluation and Prediction of Protective Performance for Epoxy Systems and Epoxy/Polyurethane Systems in Wet and Dry Environments

Evaluation and Prediction of Protective Performance for Epoxy Systems and Epoxy/Polyurethane Systems in Wet and Dry Environments
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Current coating practice requires the thickness of anti-corrosion organic coatings to be over 250 for immersion parts of ships and offshore structures and the protective performance of these coatings has been evaluated by destructive and qualitative analysis. Recently, Electrochemical Impedance Spectroscopy (EIS) method has been employed, as an alternative, to evaluate corrosion resistance of organic coatings. This method is characterized as being nondestructive, reproducible, and quantitative in evaluating aging of organic coatings. 

Product Number: 41206-258-SG
Author: Chul-Hwan Lee, Chil-Seok Shin, Kwang-Ki Baek
Publication Date: 2006
Industry: Coatings
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$20.00
$20.00

Current coating practice requires the thickness of anti-corrosion organic coatings to be over 250 for immersion parts of ships and offshore structures and the protective performance of these coatings has been evaluated by destructive and qualitative analysis. Recently, Electrochemical Impedance Spectroscopy (EIS) method has been employed, as an alternative, to evaluate corrosion resistance of organic coatings. This method is characterized as being nondestructive, reproducible, and quantitative in evaluating aging of organic coatings. In this investigation, EIS method was adopted to quantitatively and effectively select the coating systems having optimized protective performance. The evaluation of several epoxy and epoxy/polyurethane coating systems which are typically used for ships and offshore structures was carried out in wet (50, 90) and dry(room temp.) environments to accelerate the degradation of the organic coatings. These results were compared with the conventional scribed test results. The plausible prediction model for determining the remaining lifetime of coating systems was also proposed based on variations of impedance data, FT-IR and Tg measurements results.

Current coating practice requires the thickness of anti-corrosion organic coatings to be over 250 for immersion parts of ships and offshore structures and the protective performance of these coatings has been evaluated by destructive and qualitative analysis. Recently, Electrochemical Impedance Spectroscopy (EIS) method has been employed, as an alternative, to evaluate corrosion resistance of organic coatings. This method is characterized as being nondestructive, reproducible, and quantitative in evaluating aging of organic coatings. In this investigation, EIS method was adopted to quantitatively and effectively select the coating systems having optimized protective performance. The evaluation of several epoxy and epoxy/polyurethane coating systems which are typically used for ships and offshore structures was carried out in wet (50, 90) and dry(room temp.) environments to accelerate the degradation of the organic coatings. These results were compared with the conventional scribed test results. The plausible prediction model for determining the remaining lifetime of coating systems was also proposed based on variations of impedance data, FT-IR and Tg measurements results.

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