Abstract
Based on electrochemical impedance spectroscopy (EIS) measurements with a specially designed offset-cell, the protection performance of epoxy-based coatings in terms of coating resistance over cut edges was investigated. The edges were rounded with different mechanical and thermal tools, including CO2-laser, solid-state laser, plasma beam, grinding and milling tools. Two coating systems for ballast water tank environments and two rounding radii were considered. The samples were investigated by means of a specially designed EIS offset-cell suited for applications to edge geometries. The target parameter for the assessment of the protection performance of the coatings was a critical exposure time for RC < 106 Ω, whereby RC is the coating resistance. The critical exposure time could be linked to various coating defects, namely to blistering. Results of statistical investigations revealed statistically insignificant effects of the edge rounding radius.
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