期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 286, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.122916
关键词
Localized corrosion; pH; Reinforcing steel; Concrete pore solution; Inhibitor
资金
- National Natural Science Foundation of China [51878610, 51778578]
- Natural Science Foundation of Ningbo [2019C50015]
- Natural Science Foundation of Zhe-jiang Province [LGG21E080006]
- Research topics of higher education in Zhejiang Province [KT2020157]
- Ningbo 2025 Science and Technology Major Project [2019B10049, 2020Z035, 2020Z040]
- Ningbo Education Science Planning Project [2019YGH025]
A synergistic inhibiting effect on the corrosion of reinforcing steel can be achieved by mixing different proportions of BTA and Na2HPO4, with the optimum performance obtained in a mixture of 0.05 M BTA and 0.05 M Na2HPO4. The mechanism involves the formation of a protective film on the steel surface, while mixtures with unequal amounts may lead to antagonistic effects.
The synergetic inhibiting effect of benzotriazole (BTA) and Na2HPO4 for the corrosion of reinforcing steel in the chloride-contaminated carbonated solutions was preliminarily investigated by electrochemical measurements, as well as X-ray photoelectron spectroscopy and scanning electron microscopy/energy dispersive X-ray techniques. Results show that a mixture of BTA and Na2HPO4 acts as an anodic inhibitor. An optimum enhanced inhibition efficiency was obtained for a mixture of 0.05 M BTA and 0.05 M Na2HPO4. The synergistic inhibiting mechanism for steel was proposed, which was by forming a protec-tive film consisting of Fe-n(BTA)(m) complex and iron phosphates, as well as hydrogen bonding between them on the steel surface. On the contrary, a mixture of unequal amount of BTA and Na2HPO4 showed an antagonistic effect on corrosion inhibition resulting from the competition between the phosphate ions and BTA- on the steel surface. (C) 2021 Published by Elsevier Ltd.
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