环氧/氟碳复合涂层失效过程的电化学阻抗谱研究(英文)  

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

作　　者：庞然[1] 左禹[1] 唐聿明[1] 熊金平[1] 

机构地区：[1]北京化工大学材料科学与工程学院,碳纤维与功能高分子教育部重点实验室,北京100029

出　　处：《物理化学学报》2012年第5期1146-1152,共7页Acta Physico-Chimica Sinica

基　　金：The project was supported by the National Key Technologies R&D Program of China(2007 BAB 27 B04)~~

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.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.

关 键 词：氟碳涂层 电化学阻抗谱 性能 失效 快速评价 相角 

分 类 号：O646[理学—物理化学] TG174[理学—化学]