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

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 Fe 2+ to generate FeMoO 4 , Fe 2 SiO 4 and Fe 7 SiO 10 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/cm 2 .