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Erschienen in: Journal of Coatings Technology and Research 6/2018

24.04.2018

Impedance sensor for the early failure diagnosis of organic coatings

verfasst von: Guangyi Cai, Haowei Wang, Dan Jiang, Zehua Dong

Erschienen in: Journal of Coatings Technology and Research | Ausgabe 6/2018

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Abstract

A miniature impedance sensor used for field diagnosis of the early failure of coatings has been developed based on microelectronics and electrochemical impedance spectroscopy (EIS). The aging process of polyurethane-based coatings in salt spray test chamber was studied using the impedance sensor. Several critical indexes related to EIS such as phase angle (θ10Hz, θ15kHz), breakpoint frequency (fb), specific capacitance (C10Hz, C15kHz), and impedance modulus (Z0.1Hz) were proposed to evaluate the severity of coating degradation. The results indicated that the impedance sensor could accurately monitor the degradation process of coatings, and once Z0.1Hz < 106 Ω cm2, fb > 100 Hz, or θ10Hz < 20°, the coating may be regarded as completely degraded and fails to protect the metal substrate.

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Metadaten
Titel
Impedance sensor for the early failure diagnosis of organic coatings
verfasst von
Guangyi Cai
Haowei Wang
Dan Jiang
Zehua Dong
Publikationsdatum
24.04.2018
Verlag
Springer US
Erschienen in
Journal of Coatings Technology and Research / Ausgabe 6/2018
Print ISSN: 1547-0091
Elektronische ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-018-0072-5

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