Enhanced corrosion resistance of austenitic Fe-Mn-C TWIP steel by cerium(III) in 1M hydrochloric acid pickling solution

摘要

The influence of rare earth Ce3+ ions on the corrosion behaviour of Fe-Mn-C TWIP steel in 1M hydrochloric acid solution was studied by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Electrochemical corrosion tests showed that Ce3+ can significantly reduce corrosion deterioration up to 1.0mM. Beyond that level the corrosion rate increases till a steady value. Surface film resistance increases with time evolution until 24h, then decreases and stabilises. High corrosion protection of steel surface after 24h exposure to the acidic solution containing the optimal Ce3+ ion concentration is revealed by SEM investigations.