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- Title
EIS study on corona discharge degradation of epoxy resin: micro-structure evaluation and water diffusion.
- Authors
Yang, Yue; Wang, Zheng; Wang, Yumin; Zhang, Jinshuai; Peng, Xiangyang; Fang, Pengfei
- Abstract
The discharge corrosion of glass fiber reinforced epoxy resin rods is considered as a primary factor in the fracture of composites insulators. Therefore, studying the discharge corrosion of epoxy resin is meaningful. In this study, Electrochemical Impedance Spectroscopy (EIS) in conjunction with Fourier transform infrared spectroscopy, scanning electron microscopy (SEM) are applied to evaluate the microstructure evaluation and water diffusion of epoxy resin under corona discharge. Polar groups including N–H, N–C bonds and aromatic nitro-compounds are generated, leading to decrease of water contact angle. Blisters are generated on the surface after corona treatment, likely induced by overheating, and their dimensions increase with treatment time. After 6 h treatment, micro-cracks are observed on surface of blisters. EIS diagrams showed two time constant at middle frequencies attributing to surface blisters and inner structure defects after corona treatment. The water diffusion coefficient of corona treated samples increases from 0.11 × 10−11 cm2s−1 to 72.89 × 10−11 cm2s−1 along with porosity upgraded to 1000 times to virgin sample, as treatment time prolongs. The generation of polar groups, micro-cracks, and development of structure defects from surface to deeper position accelerate water diffusion in epoxy resin. The process of blistering on the surface of epoxy resin under corona discharge gradually leads to structure defects, resulting in increased porosity and loss of barrier properties.
- Subjects
EPOXY resins; CORONA discharge; FOURIER transform infrared spectroscopy; MICROSTRUCTURE; COMPOSITE insulators
- Publication
Journal of Materials Science: Materials in Electronics, 2024, Vol 35, Issue 1, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-11755-2