Synergistic inhibition effect of rare earth cerium(IV) ion and anionic surfactant on the corrosion of cold rolled steel in H_2SO_4 solution

摘要

The synergistic inhibition effect of rare earth cerium(IV) ion and anionic surfactant of sodium oleate (C_(17)H_(33)-COONa, SO) on the corrosion of cold rolled steel (CRS) in H_2SO_4 solution was first investigated by weight loss and potentiodynamic polarization methods. The results revealed that SO had a moderate inhibitive effect, and the adsorption of SO obeyed the Freundlich adsorption isotherm. For the cerium(IV) ion, it had a negligible effect. However, incorporation of Ce~(4+) with SO significantly improved the inhibition performance, and produced strong synergistic inhibition effect. Depending on the results, the syner-gism mechanism was proposed.