Abstract
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.
Highlights
The corrosion of structural materials in the deep-sea environment is a critical issue to be solved urgently [1,2,3]
Epoxy resin-based coating was used in this study, which consisted of E44 epoxy resin
Regarding the Electrochemical noise (EN) of coated metal system, two stages can be distinguished depending on the corrosion characteristics of EN time records
Summary
The corrosion of structural materials in the deep-sea environment is a critical issue to be solved urgently [1,2,3]. Employing organic coatings is one of the most widely used means to avoid corrosion of metals. Coating deterioration cannot be timely detected in the deep-sea environment, resulting in a hidden corrosion destruction of the metal beneath the coating. Electrochemical noise (EN) is known as a relatively mature electrochemical technology in corrosion research [4,5], since it has the characteristics of in-situ and nondestructive detection. According to the measurement of corrosion responses of metal substrate, EN can be effectively utilized to study the failure behavior of coating/metal system [6,7,8,9,10].
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