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

Abstract

The influence of rare earth Ce3+ ions on the corrosion behaviour of Fe‐Mn‐C TWIP steel in 1 M 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 1.0 mM. Beyond that level the corrosion rate increases till a steady value. Surface film resistance increases with time evolution until 24 h, then decreases and stabilises. High corrosion protection of steel surface after 24 h exposure to the acidic solution containing the optimal Ce3+ ion concentration is revealed by SEM investigations.

A Novel Self-Healing Conversion Film Formed on Rebar in Solution Containing Cerium and Molybdenum Ions

“…Studies have shown [19][20][21] that metals treated with cerium present enhanced corrosion resistance. Cerium's outermost electrons are not tightly sealed to the nucleus, and the electronegativity is extremely low; accordingly, a strong attraction exists between Ce and Fe atoms, which increases the bonding force in the rebar and film.…”