氟碳涂层对海洋环境下混凝土抗氯离子渗透性能的影响  

Effects of Fluorocarbon Coating on Resistance to Chloride Ion Penetration of Concrete in Marine Environment

作　　者：李伟华[1,2] 廖晓[1] 季涛[3] 吴世军 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]中国科学院海洋研究所,山东青岛266071 [3]同济大学材料学院,上海200092

出　　处：《表面技术》2017年第12期43-47,共5页Surface Technology

基　　金：国家杰出青年科学基金(51525903);国家自然科学基金项目(51401185)~~

摘　　要：目的研究不同氟碳涂层体系对海洋环境下混凝土抗氯离子渗透性能的影响规律及作用机理。方法以溶剂型氟碳涂层和水性氟碳涂层为研究对象,开展了两种溶剂型氟碳涂层体系和一种水性氟碳涂层体系的研究,即环氧底漆-溶剂型氟碳面漆、环氧底漆-聚氨酯中层漆-溶剂型氟碳面漆及水性环氧底漆-水性氟碳面漆。通过氯离子电迁移快速试验,研究涂覆这三种氟碳涂层体系的混凝土抗氯离子渗透性能。采用干湿循环试验模拟浪花飞溅区,通过混凝土抗氯离子侵蚀试验及扫描电镜观察试验,研究涂层对混凝土在海洋环境浪花飞溅区的防腐性能。结果氯离子电迁移快速试验测得的氯离子扩散系数表明,氟碳涂层体系作用下,混凝土氯离子扩散系数降低。干湿循环试验36 d后,通过扫描电镜观察发现这两种溶剂型氟碳涂层体系表面仍然致密,水性氟碳涂层体系表面出现裂缝。结论溶剂型和水性氟碳涂层体系均能提高混凝土抗氯离子渗透性,溶剂型氟碳涂层体系在海洋浪花飞溅区更耐久,更适用于该环境下的混凝土腐蚀防护。The work aims to study influence rule and function mechanism of different fluorocarbon coating systems on resistance to chloride ion penetration of concrete in marine environment. With solvent fluorocarbon coating system and waterborne fluorocarbon coating as study objects, a study was conducted to two kinds of solvent fluorocarbon coating systems, namely, epoxy primer-solvent fluorocarbon finish and epoxy primer-polyurethane intermediate paint-solvent fluorocarbon finish, and a kind of waterborne fluorocarbon coating system, namely, waterborne epoxy primer-waterborne fluorocarbon finish were investigated. The rapid test of chloride ions electromigration was conducted to study the resistance to chloride ion penetration of the above three fluorocarbon coating systems on concrete. Drying-wetting cycles test was conducted to simulate spray splash zone. Corrosion resistance of the coatings on concrete in the splash zone was studied by conducting chloride ion erosion resistance test and SEM observation test. The chloride ion diffusion coefficient measured in the rapid test of chloride ions electromigration showed that the diffusion coefficient of chloride ion decreased under the effect of fluorocarbon coating system. The SEM results showed that surfaces of solvent fluorocarbon coating systems were still dense and cracks appeared on the surface of waterborn fluorocarbon coating system after 36 days of drying-wetting cycle test. Therefore, both solvent and waterborne fluorocarbon coatings can improve resistance to chloride ion penetration of concrete. Moreover, the solvent fluorocarbon coating system is more durable than the waterborne fluorocarbon coating system in the splash zone, hence it is more suitable for corrosion protection of concrete in the splash zone.

关 键 词：钢筋混凝土 氟碳涂层 氯离子扩散 海洋环境 浪花飞溅区 腐蚀防护 

分 类 号：TG174.45[金属学及工艺—金属表面处理]