The Adsorbing Effect of Calcined Layered Double Hydroxide for Chloride Ions in Simulated Concrete Pore Solutions  

作　　者：唐聿明 ZHAO Xuhui NIU Le 左禹 

机构地区：[1]School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing Key Laboratory of Electrochemical Process and Technology for Materials

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第2期278-283,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(51171014 and 51210001);the Fundamental Research Funds for the Central Universities(No.ZZ1116)

摘　　要：The adsorbing effect of calcined layered double hydroxide （CLDH） for chloride ions in simulated concrete pore （SCP） solutions was investigated with the potentiodynamic polarization method, impedance measurement, ion selective electrode analysis and XRD. CLDH could effectively adsorb Cl^- and increase pH value in SCP solutions containing NaCl. The chloride to hydroxyl ions ratio （[C1^-]/[OH^-]） of the solution greatly decreased by CLDH treatment. In CLDH treated SCP solution with CI-, the pitting potential of carbon steel notably increased, and the surface impedance was much higher, indicating strengthened passivation. The process of CLDH adsorbing chloride ions from SCP solutions was accompanied with the reconstruction of the layered structure.The adsorbing effect of calcined layered double hydroxide （CLDH） for chloride ions in simulated concrete pore （SCP） solutions was investigated with the potentiodynamic polarization method, impedance measurement, ion selective electrode analysis and XRD. CLDH could effectively adsorb Cl^- and increase pH value in SCP solutions containing NaCl. The chloride to hydroxyl ions ratio （[C1^-]/[OH^-]） of the solution greatly decreased by CLDH treatment. In CLDH treated SCP solution with CI-, the pitting potential of carbon steel notably increased, and the surface impedance was much higher, indicating strengthened passivation. The process of CLDH adsorbing chloride ions from SCP solutions was accompanied with the reconstruction of the layered structure.

关 键 词：pore solution CORROSION ADSORPTION CHLORIDE calcined layered double hydroxide 

分 类 号：TU528.0[建筑科学—建筑技术科学]