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Enhanced corrosion resistance of austenitic Fe‐Mn‐C TWIP steel by cerium(III) in 1 M hydrochloric acid pickling solution
Author(s) -
Rosalbino F.,
Scavino G.
Publication year - 2017
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709507
Subject(s) - pickling , twip , corrosion , hydrochloric acid , dielectric spectroscopy , materials science , scanning electron microscope , metallurgy , cerium , oxalic acid , electrochemistry , austenite , nuclear chemistry , inorganic chemistry , chemistry , microstructure , electrode , composite material
The influence of rare earth Ce 3+ 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 Ce 3+ 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 Ce 3+ ion concentration is revealed by SEM investigations.