研究了碳酸根型镁铝水滑石(LDH-MgAl-CO3)焙烧产物(CLDH)在含氯离子的中性化混凝土模拟孔隙液中对钢筋腐蚀行为的影响.极化曲线电位监测以及EIS测试表明,经CLDH处理后的孔隙液中钢筋的极化曲线出现明显的钝化区间,其腐蚀电位较未处理的有一定提高,表面的阻抗也有较大增加.此外,离子浓度分析发现,较未处理时,经CLDH处理后的孔隙液其[Cl-]/[OH-]值降低了4～5个数量级.
The effect of calcined LDH-MgAl-CO3 on rebar corrosion behavior in chloride ion contaminated neutral concrete pore solutions was investigated in this paper.Corrosion potentials of rebars in pore solutions after treatment with CLDH were higher than before treatment.According to polarization tests,passivated region of rebars in pore solutions after treatment with CLDH was found apparently instead of activation.EIS tests showed that CLDH made the impedance of specimens increase.The measurements of pH and chloride ion concentration after treatment indicated that / of pore solutions decreased by 4～5 magnitude orders.
[1]Moreno M,Morris W,Alvarez M G,et al.Corrosion ofreinforcing steel in simulated concrete pore solutions-effect of carbonation and chloride content[J].CorrosionScience,2004,46(11):2681-2699.
[2]Garces P,Andrade MC,Saez A,et al.Corrosion of rein-forcing steel in neutral and acid solutions simulating theelectrolytic environments in the micropores of concretein the propagation period[J].Corrosion Science,2005,47(2):289-306.
[3]Liu Yu(刘玉),Du Rong-gui(杜荣归),Lin Chang-jian(林昌建).Effect of chloride ions on the corrosion be-havior of reinforcing steel in simulated concrete pore so-lutions[J].Electrochemistry(电化学),2005,11(2):333-336.
[4]Vaccar Angelo.Preparation and catalytic properties ofcationic and anionic clays[J].Catalysis Today,1998,41(1/3):53-71.
[5]Liang Lu,Jing He,Xue Duan,et al.Uptake of chlorideion from aqueous solution by calcined layered doublehydroxides:Equilibrium and kinetic studies[J].WaterResearch,2006,40(4):735-743.
[6]Saremi M,Mahallati E.A study on chloride-induced de-passivation of mild steel in simulated concrete pore solu-tion[J].Cement and Concrete Research,2002,32(12):1915-1921.
[7]Du Rong-gui(杜荣归),Hu Rong-gang(胡融刚),FengZu-de(冯祖德),et al.Corrosion behavior of reinforcingsteel in concrete[J].Electrochemistry,2000,6(3):305-309.
