engleski

The influence of AC interference on electrochemical impedance spectroscopy measurements on high impedance coatings

The influence of AC interference on electrochemical impedance spectroscopy (EIS) measurements on industrial coating systems was investigated. EIS is an interesting method as it quantifies coating quality by measuring coating impedance. The study first addresses the accuracy, repeatability and reproducibility of measurements made on calibration foils inside and outside the Faraday cage under various intentional AC interferences. The relative standard deviation (RSD) of the impedance of the foils inside the Faraday cage is less than 0.5%. Outside the Faraday cage, a relationship is established between the signal-to-noise ratio, the RSD of the measurements and the relative measurement error. It was found that for the noise amplitude up to 250 mV, both the RSD and the relative error can be kept below 5 % by increasing the DEIS signal amplitude to 250 mV and taking average of ten repeated measurements.

EIS ; coating ; polyester ; AC interferences

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