Embedded Microelectrode for In situ Electrochemical Impedance Spectroscopy Measurement of Organic Coating Under Marine Alternating Hydrostatic Pressure
A kind of circular loop microelectrode was designed and embedded in the coating body during coating fabrication.Then a novel electrochemical impedance spectroscopy（EIS） measurement system was developed based on the embedded-microelectrode（EM）,which was suitable for in situ evaluation of the coating in alternating hydrostatic pressured（AHP） sea-water with the purpose of simulation of deep sea environments.The results showed that EM could avoid difficulties related with the installation of an external electrode and could overcome drawbacks that the detected signals of the corrosion of metal beneath thick coatings was too weak for the field measurement by an external electrode.Therefore,the EM can be utilized in high hydrostatic pressured or AHP sea-water environment.The EIS results of the EM system were consistent well with those of the traditional three-electrode measuring device.Consequently,the validity and reliability of EM were reasonably confirmed.
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