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Impedance sensor for the early failure diagnosis of organic coatings

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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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Acknowledgments

This research was supported by the National Natural Science Foundation of China (Projects Nos. 51371087 and 50971064) and the Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control of China Special Vehicle Research Institute.

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Authors and Affiliations

  1. Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Guangyi Cai, Dan Jiang & Zehua Dong

  2. China Special Vehicle Research Institute, Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control, Jingmen, 448035, China

    Haowei Wang

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  1. Guangyi Cai
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Correspondence to Zehua Dong.

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Cai, G., Wang, H., Jiang, D. et al. Impedance sensor for the early failure diagnosis of organic coatings. J Coat Technol Res 15, 1259–1272 (2018). https://doi.org/10.1007/s11998-018-0072-5

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