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环氧/氟碳复合涂层失效过程的电化学阻抗谱研究
引用本文:庞然,左禹,唐聿明,熊金平. 环氧/氟碳复合涂层失效过程的电化学阻抗谱研究[J]. 物理化学学报, 2012, 28(5): 1146-1152. DOI: 10.3866/PKU.WHXB201202272
作者姓名:庞然  左禹  唐聿明  熊金平
作者单位: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
摘    要:用电化学阻抗技术研究了环氧富锌底漆、环氧云铁中间漆和氟碳面漆构成的多层复合涂层在四种不同腐蚀环境中的失效过程.涂层在四种环境中的失效速率按下列顺序降低:3.5%NaCl浸泡+紫外照射,45℃湿热环境,35℃盐雾试验,3.5%NaCl浸泡.尽管涂层在四种不同环境中失效速率差别很大,但不同环境中阻抗中频区的相角,尤其是10Hz频率的相角,与涂层的低频阻抗值变化趋势非常接近.由于中频区的相角可以快速测量,因此可以作为在工程现场定性评价涂层保护性能的参数.

关 键 词:氟碳涂层  电化学阻抗谱  性能  失效  快速评价  相角  
收稿时间:2011-12-30
修稿时间:2012-02-27

Electrochemical Impedance Spectroscopy Study of Failure Process of an Epoxy/Fluorocarbon Coating System
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(5): 1146-1152. DOI: 10.3866/PKU.WHXB201202272
Authors:PANG Ran    ZUO Yu    TANG Yu-Ming    XIONG Jin-Ping
Affiliation: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
Abstract: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.
Keywords:Fluorocarbon coating  Electrochemical impedance spectroscopy  Performance  Failure  Fast evaluation  Phase angle
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