Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions
Corrosion inhibitors for steel, such as sodium phosphate (Na3PO4), sodium nitrite (NaNO2), and benzotriazole (BTA), in simulated concrete pore solutions (saturated Ca(OH)2) were investigated. Corrosion behaviors of steel in different solutions were studied by means of corrosion potential (E corr), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). A field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray analysis (EDXA) was used for observing the microstructures and morphology of corrosion products of steel. The results indicate that, compared with the commonly used nitrite-based inhibitors, Na3PO4 is not a good inhibitor, while BTA may be a potentially effective inhibitor to prevent steel from corrosion in simulated concrete pore solutions.
Keywordssteel corrosion inhibitors electrochemical analysis concrete solutions
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- N.S. Berke, M.C. Hicks, J. Malone, and K.A. Rieder, Concrete durability—a holistic approach, Concr. Int., 27(2005), No.8, p.63.Google Scholar
- L. Bertolini, B. Elsener, P. Pedeferri, and R. Polder, Corrosion of Steel in Concrete, Wiley-VCH, Weinheim, 2004, p.218.Google Scholar
- Y.F. Chen, W. Wang, and J.X. Yang, Inhibition effects of di-(2-ethylhexyl)-sebacate on corrosion of reinforcing steel in stimulated concrete pore solution, J. Univ. Sci. Technol. Beijing (in Chinese), 29(2007), Suppl.1, p.21.Google Scholar