环氧/聚氨酯涂层在4种环境中失效行为的EIS  

Failure behaviors of epoxy/acrylic polyurethane organic coatings in corrosive media by EIS

作　　者：庞然[1] 左禹[2] 唐聿明[2] 熊金平[2] 初必旺[1] 

机构地区：[1]北京化工大学理学院,北京100029 [2]北京化工大学材料学院,北京100029

出　　处：《化工学报》2010年第10期2656-2661,共6页CIESC Journal

摘　　要：用电化学交流阻抗法(EIS)研究了环氧富锌底漆/环氧云铁中间漆/丙烯酸聚氨酯面漆这一涂层体系在3.5%NaCl溶液、3.5%NaCl溶液+紫外辐射、湿热和盐雾这4种环境中的失效行为,探讨了特征频率下的相位角和涂层电阻值之间对应的关系。结果表明:中频区10Hz处涂层相位角随时间的变化曲线和涂层电阻值随时间的变化曲线有良好的相似性,据此可以对所研究的涂层体系失效程度进行快速评价;所试验的4种腐蚀环境对所研究的涂层体系的破坏作用由小到大依次为:3.5%NaCl溶液<盐雾<湿热<3.5%NaCl溶液+紫外辐射。Failure behaviors of the organic coating system,zinc-rich epoxy primer/epoxy coating with mica iron/acrylic polyurethane topcoat,in corrosive media,including 3.5% NaCl solution,3.5% NaCl solution ＋ UV radiation,moist heat and salt spray,were studied with electrochemistry impedance spectra （EIS）.The relationships between coating resistance and phase angle were analyzed.The results indicated that phase angle at middle frequency of 10 Hz and coating resistance showed similar decreasing tendencies,hence these phase angle parameters may be used as quick measurements to evaluate coating performance.The order of the damaging effect of the four corrosive environments on carbon steel was 3.5% NaCl solution salt spray moist heat 3.5% NaCl solution ＋ UV radiation.

关 键 词：有机涂层 电化学交流阻抗法 相位角 

分 类 号：TG174.46[金属学及工艺—金属表面处理]