The adsorbing effect of calcined layered double hydroxide for chloride ions in simulated concrete pore solutions

Abstract

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 ([Cl⁻]/[OH⁻]) of the solution greatly decreased by CLDH treatment. In CLDH treated SCP solution with Cl⁻, 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.

Keywords

pore solution / corrosion / adsorption / chloride / calcined layered double hydroxide

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