This paper describes the application of two electrochemical methods to assess in-service Navy ship-hull paint coatings. A modified electrochemical noise analysis (ENA) method was used to measure the electrochemical coating current (ECC) passed by a coating. Electrochemical impedance spectroscopy (EIS) was used to measure the coating electrical impedance. Hull coating test areas included 1) newly coated, and 2) old in-service areas which had been power-washed and/or spot-repaired. The purpose was to determine whether or not ECC and/or EIS can clearly distinguish between the different areas tested and to evaluate portable ECC and EIS instrumentation for relative effectiveness and practical application as coatings field assessment tools to aid ship yard maintenance and planning.

Subject
Electrochemical impedance spectroscopy, Coatings, Sensors, Electrochemical cells, Laboratory data, Electrochemical noise, Instrumentation, Electrochemical current, Experimental data, Hull, Dry film thickness, Paints, Coating systems
Keywords:
coatings, sensors, seawater immersion, electrochemical coating current, electrochemical coating impedance
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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