Citation: PANG Ran, ZUO Yu, TANG Yu-Ming, XIONG Jin-Ping. Electrochemical Impedance Spectroscopy Study of Failure Process of an Epoxy/Fluorocarbon Coating System[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1146-1152. doi: 10.3866/PKU.WHXB201202272 shu

Electrochemical Impedance Spectroscopy Study of Failure Process of an Epoxy/Fluorocarbon Coating System

1.
Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Received Date: 30 December 2011
Available Online: 27 February 2012
Fund Project: 国家科技支撑计划项目(2007 BAB 27 B04)资助 (2007 BAB 27 B04)

The failure processes of a multi-layer coating system (zinc-rich epoxy primer, epoxy middle layer, and fluorocarbon topcoat) in four corrosion environments were studied with electrochemical impedance spectroscopy (EIS). The failure rate of the coating system in the four environments decreases in following order: immersion in a 3.5% NaCl solution under UV light, steam above a water surface at 45 ℃, salt spray at 35 ℃, and immersion in a 3.5% NaCl solution at room temperature. Although the failure rates of the coating system in the four environments are different, the variations of the phase angles at the middle frequency range, particularly 10 Hz, are very close to that of the coating impedance; hence they may be used as a qualitative evaluation parameter for coating inspection.
- Fluorocarbon coating,
- Electrochemical impedance spectroscopy,
- Performance,
- Failure,
- Fast evaluation,
- Phase angle
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沈阳化工大学材料科学与工程学院沈阳 110142