Multifunctional inhibition based on layered double hydroxides to comprehensively control corrosion of carbon steel in concrete

• Published in: Corrosion science 2017-09, Vol.126, p.166-179
• Main Authors: Cao, Yanhui, Dong, Shigang, Zheng, Dajiang, Wang, Jingjing, Zhang, Xiaojuan, Du, Ronggui, Song, Guangling, Lin, Changjian
• Format: Article
• Language: English
• Subjects: A. Layered double hydroxides; A. Steel reinforced concrete; C. Corrosion protection; C. Mechanism; C. Multifunctional inhibitor; Carbon steel; Carbon steels; Carbonation; Computer simulation; Corrosion; Corrosion inhibitors; Corrosion mechanisms; Corrosion prevention; Hydroxides; Nitrogen dioxide; Rare gases; Reinforced concrete; Reinforcing steels; Stability; Studies
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2017.06.026

•A multifunctional inhibitor of MgAl-layered double hydroxides loaded with nitrites was synthesized for corrosion control of steel in concrete.•The synthesized LDHs are able to provide a comprehensive protection for steel in both simulated carbonated concrete pore solutions and concrete.•A conceptual model was proposed for presenting the corrosion protection mechanism of such multifunctional inhibitor for reinforced concrete. A novel multifunctional inhibitor of MgAl-layered double hydroxides (LDHs) loaded with nitrite anions was synthesized via a calcination-rehydration in ambient atmosphere without inert gas protection. It was demonstrated that such LDHs loaded with inhibitor was able to efficiently control the corrosion of carbon steel in simulated carbonated concrete pore (SCCP) solution as well as in mortar. Based on the systematic measurements, a conceptual model was proposed to further understand the mechanism of multifunctional corrosion protection of MgAl-LDHs-NO2− in steel reinforced concrete. Such unique multifunctional composite is markedly helpful to comprehensively control corrosion of steel in concrete.