Design of cathodic protection potentials and impressed current densities in ICCP systems for ships with coating defects
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ICCP is commonly applied to ships in combination with coatings to prevent corrosion; however, coating failures increase current demand. Therefore, understanding the relationship between ICCP and coating defects is essential for optimizing ICCP system under practical operating conditions. This study identifies the optimal cathodic protection potentials, considering coating defect rates as a key variable. Furthermore, the impressed current densities for the cathodic potentials were calculated, measured, and simulated. The coefficients of determination of 0.996 and 0.962 for the simulation and experimental results, respectively, indicate a strong corre-lation, demonstrating that the obtained values were highly consistent. The comparison suggests that minor discrepancies arose due to the formation of oxide films during potentiostatic tests. The assessment of cathodic potential effectiveness confirmed that -0.7 V also provided excellent protective performance. This study provides insights into ICCP operation and design strategies for practical operat-ing conditions through electrochemical tests, computer simulation, and material characterization.
Abstract
ICCP is commonly applied to ships in combination with coatings to prevent corrosion; however, coating failures increase current demand. Therefore, understanding the relationship between ICCP and coating defects is essential for optimizing ICCP system under practical operating conditions. This study identifies the optimal cathodic protection potentials, considering coating defect rates as a key variable. Furthermore, the impressed current densities for the cathodic potentials were calculated, measured, and simulated. The coefficients of determination of 0.996 and 0.962 for the simulation and experimental results, respectively, indicate a strong corre-lation, demonstrating that the obtained values were highly consistent. The comparison suggests that minor discrepancies arose due to the formation of oxide films during potentiostatic tests. The assessment of cathodic potential effectiveness confirmed that -0.7 V also provided excellent protective performance. This study provides insights into ICCP operation and design strategies for practical operat-ing conditions through electrochemical tests, computer simulation, and material characterization.