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Novel Ca-SLS-LDH nanocomposites obtained via lignosulfonate modification for corrosion protection of steel bars in simulated concrete pore solution
Abstract A novel nanocomposite (Ca-SLS-LDH) of Ca-Al-layered double hydroxides (Ca-LDH) modified with sodium lignosulfonate (SLS) was synthesized using hydrothermal synthesis method. Mechanistically, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) analysis revealed that SLS modified the nanocomposite by adsorbing onto the surface of Ca-LDH. The specific surface area of Ca-SLS-LDH was larger and the average particle size was smaller than that of Ca-LDH. This enabled the Ca-SLS-LDH to bind chlorides more effectively and is hence suitable for application in reinforced concrete. Ca-SLS-LDH binds to chlorides through ion exchange and surface adsorption, which is similar to the binding mechanism of Ca-LDH to chlorides. Ca-SLS-LDH efficiently controlled the corrosion of carbon steel in simulated concrete pore (SCP) solution and had a stronger inhibitory effect compared to unmodified LDHs at equal concentrations. Ca-SLS-LDH improved the resistance to corrosion by binding more chlorides in SCP solution. In addition, it may be due to the anti-corrosion effect of SLS on steel bars, thereby delaying the initiation of corrosion.
Highlights The nanocomposite of Ca-LDH surface-modified by SLS was synthesized by hydrothermal synthesis method. Ca-SLS-LDH with larger specific surface area exhibited higher chloride binding capacity. Chloride binding mechanism of Ca-SLS-LDH was investigated. Ca-SLS-LDH had a better corrosion inhibition effect in SCP solution.
Novel Ca-SLS-LDH nanocomposites obtained via lignosulfonate modification for corrosion protection of steel bars in simulated concrete pore solution
Abstract A novel nanocomposite (Ca-SLS-LDH) of Ca-Al-layered double hydroxides (Ca-LDH) modified with sodium lignosulfonate (SLS) was synthesized using hydrothermal synthesis method. Mechanistically, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) analysis revealed that SLS modified the nanocomposite by adsorbing onto the surface of Ca-LDH. The specific surface area of Ca-SLS-LDH was larger and the average particle size was smaller than that of Ca-LDH. This enabled the Ca-SLS-LDH to bind chlorides more effectively and is hence suitable for application in reinforced concrete. Ca-SLS-LDH binds to chlorides through ion exchange and surface adsorption, which is similar to the binding mechanism of Ca-LDH to chlorides. Ca-SLS-LDH efficiently controlled the corrosion of carbon steel in simulated concrete pore (SCP) solution and had a stronger inhibitory effect compared to unmodified LDHs at equal concentrations. Ca-SLS-LDH improved the resistance to corrosion by binding more chlorides in SCP solution. In addition, it may be due to the anti-corrosion effect of SLS on steel bars, thereby delaying the initiation of corrosion.
Highlights The nanocomposite of Ca-LDH surface-modified by SLS was synthesized by hydrothermal synthesis method. Ca-SLS-LDH with larger specific surface area exhibited higher chloride binding capacity. Chloride binding mechanism of Ca-SLS-LDH was investigated. Ca-SLS-LDH had a better corrosion inhibition effect in SCP solution.
Novel Ca-SLS-LDH nanocomposites obtained via lignosulfonate modification for corrosion protection of steel bars in simulated concrete pore solution
Chen, Mengzhu (author) / Cai, Yuxin (author) / Zhang, Mingtao (author) / Yu, Linwen (author) / Wu, Fang (author) / Jiang, Jinyu (author) / Yang, Huan (author) / Bi, Renke (author) / Yu, Yang (author)
Applied Clay Science ; 211
2021-06-13
Article (Journal)
Electronic Resource
English
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