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Open AccessArticle

Effect of Asymmetric Epoxy Coating/Metal Electrodes on the Electrochemical Noise Measurements Under Marine Alternating Hydrostatic Pressure

by Fandi Meng 1, Yushan Liu 1, Li Liu 1,*, Yu Cui 2 and Fuhui Wang 1,2
1
Shenyang National Laboratory for Materials Science, Northeastern University, Wenhua Road 3-11, Shenyang 110819, China
2
Institute of Metal Research, Chinese Academy of Sciences, Wencui Road 62, Shenyang 110016, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(12), 852; https://doi.org/10.3390/coatings9120852
Received: 11 November 2019 / Revised: 8 December 2019 / Accepted: 11 December 2019 / Published: 12 December 2019
Electrochemical noise (EN) is expected to be an in-situ evaluation method for coating performance in the real deep-ocean environment. The asymmetric factors of working electrodes (WEs) in EN configuration, including coating area, coating thickness, and coating impedance, were considered under marine alternating hydrostatic pressure (AHP) condition. The effect of WE asymmetry was discussed mainly by EN time records, wavelet analysis and shot noise method. The results indicated that coating impedance is the most important factor, and the coating with higher impedance contributes more to current noise in a pair of electrodes. The reason of asymmetry influence on EN measurements is mainly by the variation of average charge of current sources but not the current source frequency during the initial period of coating failure process. When the obvious corrosion of metal substrate happens, the corresponding EN proportion relationship between coating/metal WEs may be not exist. View Full-Text
Keywords: epoxy coating; electrochemical noise; asymmetric electrode; shot noise analysis; wavelet analysis; alternating hydrostatic pressure epoxy coating; electrochemical noise; asymmetric electrode; shot noise analysis; wavelet analysis; alternating hydrostatic pressure
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Meng, F.; Liu, Y.; Liu, L.; Cui, Y.; Wang, F. Effect of Asymmetric Epoxy Coating/Metal Electrodes on the Electrochemical Noise Measurements Under Marine Alternating Hydrostatic Pressure. Coatings 2019, 9, 852.

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