Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions

摘要

Corrosion inhibitors for steel, such as sodium phosphate (Na_3PO_4), sodium nitrite (NaNO_2), 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, Na_3PO_4 is not a good inhibitor, while BTA may be a potentially effective inhibitor to prevent steel from corrosion in simulated concrete pore solutions.