| LI Wei-hua,LIAO Xiao,JI Tao,WU Shi-jun.Effects of Fluorocarbon Coating on Resistance to Chloride Ion Penetration of Concrete in Marine Environment[J],46(12):43-47 |
| Effects of Fluorocarbon Coating on Resistance to Chloride Ion Penetration of Concrete in Marine Environment |
| Received:June 17, 2017 Revised:December 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.009 |
| KeyWord:reinforced concrete fluorocarbon coating chloride diffusion marine environment spray splash zone corrosion protection |
| Author | Institution |
| LI Wei-hua |
1.School of Civil Engineering, Qingdao Technological University, Qingdao , China; 2.Institute of Marine Science, Chinese Academy of Sciences, Qingdao , China |
| LIAO Xiao |
School of Civil Engineering, Qingdao Technological University, Qingdao , China |
| JI Tao |
School of Materials, Tongji University, Shanghai , China |
| WU Shi-jun |
School of Civil Engineering, Qingdao Technological University, Qingdao , China |
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| Abstract: |
| 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 sol-vent 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 fluo-rocarbon coating system in the splash zone, hence it is more suitable for corrosion protection of concrete in the splash zone. |
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