Journal
MATERIALS LETTERS
Volume 236, Issue -, Pages 517-520Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.10.177
Keywords
Layered double hydroxide; Particles nanosize; Controlled release; Corrosion; Chloride Long term
Funding
- National Key Research and Development Program of China [2017YFB0702300]
- National Natural Science Foundation of China [51222106]
- National Basic Research Program of China (973 Program) [2014CB643300]
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Zn-Al-NO2 layered double hydroxide (LDH) is proposed as a controlled-release inhibitor for steel reinforcements in chloride-contaminated concrete. The cumulative amount of nitrite released from LDH is sensitive to the chloride concentration in the solution. Compared with NaNO2, Zn-Al-NO2 LDH increased the chloride threshold value from 0.15 to 0.25 M and simultaneously decreased the critical [NO2]/[Cl] molar ratio from 0.09 to 0.02. In conclusion, the Zn-Al-NO2 LDH exhibits considerably higher inhibiting performance due to the on-demand release of NO2-. (C) 2018 Elsevier B.V. All rights reserved.
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