活性瓷釉(CRE)涂层钢筋耐腐蚀性能试验研究
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摘要
为了深入了解CRE涂层对钢筋耐腐蚀性能的提升作用,通过电化学阻抗谱(EIS)对CRE涂层钢筋的耐腐蚀性能进行定量研究。结果表明,在同样的腐蚀环境中,CRE涂层的电荷转移电阻(R_(ct))是无涂层钢筋的21.7倍,其孔隙电阻(R_p)则是无涂层钢筋的49.4倍。电荷转移电阻和孔隙电阻均能体现涂层对外界腐蚀介质的阻隔作用,可以认为CRE涂层可以对钢筋起到保护作用并且明显提升钢筋的耐腐蚀能力。
In order to understand the effect of Chemically Reactive Enamel coating on steel bars,corrosion resistance of CRE coated was quantitatively studied by electrochemical methods.Results show that,in the same corrosive environment,charge transfer resistance(R_(ct)) and pore resistance(R_p) of CRE coated steel are 21.7 times and 49.4 times that of uncoated steel,respectively.Both charge transfer resistance and pore resistance can reflect the barrier effect of the coating in the corrosive environment,so it can be considered that CRE coating can protect the steel and significantly improve the corrosion resistance of steel.
In order to understand the effect of Chemically Reactive Enamel coating on steel bars,corrosion resistance of CRE coated was quantitatively studied by electrochemical methods.Results show that,in the same corrosive environment,charge transfer resistance(R_(ct)) and pore resistance(R_p) of CRE coated steel are 21.7 times and 49.4 times that of uncoated steel,respectively.Both charge transfer resistance and pore resistance can reflect the barrier effect of the coating in the corrosive environment,so it can be considered that CRE coating can protect the steel and significantly improve the corrosion resistance of steel.
引文
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[14]Wu L K,Hu J M,Zhang J Q,et al.A silica co-electrodeposition route to highly active Ni-based film electrodes[J].Journal of Materials Chemistry A,2013,1(41):12885-12892.
[2]罗文森,刘颖峰,李福海.电化学腐蚀对钢筋与混凝土黏结强度的影响[J].结构工程师,2017,33(4):47-54.Luo Wensen,Liu Yingfeng,Li Fuhai.Influence of electrochemical corrosion on reinforced-concrete bond strength[J].Structural Engineers,2017,33(4):47-54.(in Chinese)
[3]汤志杰,廖开星,李毅,等.核电厂钢筋混凝土构筑物氯离子侵蚀评估[J].结构工程师,2018,34(1):54-58.Tang Zhijie,Liao Kaixing,Li Yi,et al.Assessment of the chloride ion erosion for rc structures in NPP[J].Structural Engineers,2018,34(1):54-58.(in Chinese)
[4]Yan D,Reis S,Tao X,et al.Effect of chemically reactive enamel coating on bonding strength at steel/mortar interface[J].Construction and Building Materials,2012,28(1):512-518.
[5]Yan D,Chen S,Chen G,et al.Static and dynamic behavior of concrete slabs reinforced with chemically reactive enamel-coated steel bars and fibers[J].Journal of Zhejiang University-Science A,2016,17(5):366-377.
[6]Colreavy J,Scantlebury J D.Electrochemical impedance spectroscopy to monitor the influence of surface preparation on the corrosion characteristics of mild steel MAG welds[J].Journal of Materials Processing Technology,1995,55(3-4):206-212.
[7]Mi2kovic'-Stankovic'V B,Dra6ic'D M,Kacˇarevic'-Popovic'Z.The sorption characteristics of epoxy coatings electrodeposited on steel during exposure to different corrosive agents[J].Corrosion Science,1996,38(9):1513-1523.
[8]Fedrizzi L,Rodriguez F J,Rossi S,et al.The use of electrochemical techniques to study the corrosion behaviour of organic coatings on steel pretreated with sol-gel zirconia films[J].Electrochimica Acta,2001,46(24):3715-3724.
[9]Lasia A.Electrochemical impedance spectroscopy and its applications[M]Modern aspects of electrochemistry.Springer US,2002:143-248.
[10]Murray J N,Hack H P.Long-term testing of epoxycoated steel in ASTM seawater using electrochemical impedance spectroscopy[J].Corrosion,1991,47(6):480-489.
[11]Macdonald D D.Reflections on the history of electrochemical impedance spectroscopy[J].Electrochimica Acta,2006,51(8):1376-1388.
[12]施锦杰,孙伟.等效电路拟合钢筋锈蚀行为的电化学阻抗谱研究[J].腐蚀科学与防护技术,2011,23(5):387-392.Shi Jinjie,Sun Wei.Equivalent circuits fitting of electrochemical impendence spectroscopy for corrosion of reinforcing steel in concrete[J].Corrosion Science and Protection Technology,2011,23(5):387-392.(in Chinese)
[13]张鉴清,孙国庆,曹楚南.评价有机涂层防护性能的EIS数据处理[J].腐蚀科学与防护技术,1994,6(4):318-325.Zhang jianqing,Sun Guoqing,Cao Chunan.EIS data analysis for evaluation of protection property of organic coating[J].Corrosion Science and Protection Technique,1994,6(4):318-325.(in Chinese)
[14]Wu L K,Hu J M,Zhang J Q,et al.A silica co-electrodeposition route to highly active Ni-based film electrodes[J].Journal of Materials Chemistry A,2013,1(41):12885-12892.