| Autor: |
Ang Liu, Haohua Gu, Yongjuan Geng, Pan Wang, Song Gao, Shaochun Li |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Materials; Volume 16; Issue 7; Pages: 2913 |
| ISSN: |
1996-1944 |
| DOI: |
10.3390/ma16072913 |
| Popis: |
Layered double hydroxides (LDHs) intercalating with a corrosion inhibitor for slowing down the corrosion of a reinforcing bar has attracted considerable attention. However, achieving high-loading capacity of organic inhibitor in LDH with high efficiency and long-term protection characteristics remains an important challenge. In this work, the CaAl-LDH intercalating with eugenol (EG) was synthesized via a continuous hydrothermal method. The prepared LDHs were characterized by SEM, XRD, UV-vis absorption spectra and TGA. Additionally, the corrosion protection performances of LDH-EG for steel bar were studied in detail via the electrochemical method. The results show that the loading amount of EG in LDHs was about 30% and about 80% EG could be released from LDH-EG within 4 h in SCPs containing 3.5% NaCl. The electrochemical test results show that the Rct value (105~106 Ω · cm2) of steel-mortar incorporated with LDH-EG has increased by 3–4 orders of magnitude compared to the specimen without LDHs (102~103 Ω · cm2) after 16 dry–wet cycles corrosion test. The significantly improved protection capability is mainly derived from two aspects: one is the filling effect of LDH, which can fill the pores of mortar and improve the impermeability; another reason is that the intercalated EG can slowly diffuse out of the inner structure of LDHs in a controllable way and result in a relatively long-term effect of corrosion inhibition. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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