Investigation on Effect of Different Inhibitors on Corrosion Behavior of 45# Steel in Simulated Concrete Pore Solution

Abstract

Different inhibitors are added into the simulated concrete pore solution to inhibit the corrosion process of 45# steel. The effect of different inhibitors on surface morphology, roughness, corrosion inhibition efficiency, and corrosion behavior of 45# steel in simulated concrete pore solution is studied. The corrosion inhibition efficiency of sodium molybdate is about 30%, and that of sodium silicate is about 50%. However, the inhibition efficiency of sodium molybdate mixed with sodium silicate is approximate 75%. It is found that sodium silicate and sodium molybdate in the solution will react with Fe2+ to generate FeMoO4, Fe2SiO4 and Fe7SiO10 that further inhibit the corrosion process resulting in denser corrosion products and smaller surface roughness. According to the potentiodynamic polarization curves, the corrosion current density of 45# steel immersed in the simulated concrete pore solution mixed with sodium silicate and sodium molybdate for 6 days is about 15.93 μA/cm2.