4.7 Article

Inhibitory effects of 5-aminouracil on cathodic reactions of steels in saturated Ca(OH)2 solutions

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CORROSION SCIENCE
卷 45, 期 9, 页码 2075-2092

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0010-938X(03)00032-5

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steel reinforced concrete; polarization; IR spectroscopy; XPS; alkaline corrosion

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The inhibitory effects of 5-aminouracil on cathodic reactions of steels were investigated using saturated Ca(OH)(2) solution to simulate the environment in pores in concrete. Polarization measurements showed that 5-aminouracil effectively inhibited these cathodic reactions, indicating the potential of 5-aminouracil as an inhibitor for macro-cell corrosion in concrete/ soil systems, which are caused by cathodic reactions in concrete. Cathodic reactions were inhibited in accordance with the Langmuir adsorption isotherm. FT-IR and XPS measurements suggested that 5-aminouracil was adsorbed onto cathodic portions of the steel through the formation of a coordination bond with the amino group, mainly in the form of dimer. (C) 2003 Elsevier Science Ltd. All rights reserved.

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