环氧富锌/氯化橡胶涂层体系腐蚀过程的电化学阻抗谱  

EIS of corrosion process of steel with zinc-rich epoxy/chlorinated rubber coatings

作　　者：李玮[1] 曹京宜[2] 熊金平[1] 左禹[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]海军涂料分析检测中心,北京102442

出　　处：《化工学报》2007年第10期2543-2547,共5页CIESC Journal

摘　　要：采用环氧富锌作为底漆、氯化橡胶作为面漆,研究了涂层体系腐蚀过程中电化学阻抗谱(EIS)的变化。结果表明,腐蚀初期环氧富锌/氯化橡胶涂层体系中底漆的厚度比例与涂层的防护性能无关;而在腐蚀中后期,随底漆厚度比例适当增大,涂层自修复能力增强,离子等腐蚀介质在涂层中的传输速度得到显著延缓,涂层吸水率和孔隙率明显降低,涂层防护性能出现短时间升高。当环氧富锌底漆为涂层总厚度的2/3左右时,涂层体系的防护性能最好,而仅有底漆或面漆的体系则不具备良好的防护性能。The failure process of zinc-rich epoxy/chlorinated rubber coatings on Q235 steel was investigated by electrochemical impedance spectroscopy （EIS） . In the initial period of exposure, EIS spectra showed that the protection effect of the coatings mainly came from the chlorinated rubber topcoat. But after a longer time of exposure, by increasing the zinc-rich epoxy primer thickness properly, the porosity of the coatings, the diffusion rate of ions and the absorbance of water in the coatings decreased remarkably. The best protection was obtained for the coating systems with the thickness ratio of primer/ topcoat about 2 ： 1. For the systems of single primer or single topcoat, the protection effect of the coatings decreased quickly.

关 键 词：电化学阻抗谱 涂层 紫外线 腐蚀 厚度 

分 类 号：TG174[金属学及工艺—金属表面处理]