Electrochemical Impedance Spectroscopy of an Al2O3/Organosilicone/SiO2 Hybrid Coating

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (6): 527-531 DOI:

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Electrochemical Impedance Spectroscopy of an Al₂O₃/Organosilicone/SiO₂ Hybrid Coating

LIU Guangming, YANG Xiaodong, LIN Jiyue, TIAN Jihong

School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

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Abstract Al₂O₃/organosilicone/SiO₂ hybrid sol was prepared by the method of sol-gel with tetraethyl orthosilicate (TEOS), methyl triethoxysilane (MTES), diphenyl dimethoxy silane (DDS) and aluminium tri-sec-butoxide as raw materials. Then a hybrid coating was obtained by drying at 100 ℃ for 12 h. The result of Fourier transform infrared spectroscopy (FT-IR) showed that the Al—O—Si bond was formed in the Al₂O₃/organosilicone/SiO₂ hybrid materials. The electrochemical impedance spectroscopy (EIS) of the coating immersed in 3.5%NaCl solution for different times was studied. The equivalent circuits were established according to the impedance spectral characteristics. The corrosion resistance of the hybrid coating was discussed based on the equivalent circuit and fitted results of electrochemical impedance spectroscopy. The results indicated that the corrosion resistance of the Al₂O₃/organosilicone/SiO₂hybrid coating was excellent in 3.5%NaCl solution.

Key words: sol-gel Al₂O₃/organosilicone/SiO₂ hybrid coating electrochemical impedance
spectroscopy

Received: 24 December 2012

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LIU Guangming,YANG Xiaodong,LIN Jiyue,TIAN Jihong. Electrochemical Impedance Spectroscopy of an Al₂O₃/Organosilicone/SiO₂ Hybrid Coating. Journal of Chinese Society for Corrosion and protection, 2013, 33(6): 527-531.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I6/527

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