摘要
采用电化学阻抗谱(EIS)研究了无机富锌底漆/环氧云铁中间漆/氯化橡胶面漆复合涂层体系在3.5%NaCl溶液中的腐蚀电化学行为,考察了紫外辐射对其电化学行为的影响。结果表明:复合涂层体系在3.5%NaCl介质中的腐蚀失效过程可以用4种等效电路来等效。浸泡失效前120h,电解质溶液电阻Rc从开始的5×109Ω.cm2以大约2.2×107Ω.h-1的速度迅速下降到4×105Ω.cm2,到浸泡120h后Rc则以较小的速度808Ω.h-1下降,涂层电容Cc是按线性增加。紫外辐射不改变复合涂层体系在3.5%NaCl溶液中的电化学行为,仅仅加速复合涂层的失效。
The corrosion electrochemical behavior of composite coatings system composed of inorganic zincrich primer, epoxy middle paste and chlorinated rubber top coating in 3.5% NaCI solution was studied with electrochemical impedance spectroscopy （EIS） . The effect of UV irradiation on the electrochemical behavior was investigated. The results showed that the corrosion process of the composite coatings in 3.5% NaC1 solution could be described in the form of four equivalent circuits. The Re of composite coatings decreased linearly atarateof2.2×10^7 Ω· h^-1 and 808 Ω · h^-1 before and after 120 h respectively, but the Ce of the coatings increased linearly. UV irradiation could accelerate the aging of the coatings but did not affect the electrochemical behavior in the solution.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第9期2288-2292,共5页
CIESC Journal
