Abstract The corrosion process of RE steel and carbon steel in 0.3 mol/L NaCl was investigated by electrochemistry impedance spectroscopy test, SEM and X diffraction analysis. The results showed RE could improve the corrosion resistance of carbon steel; compared with carbon steel, the rust layer of RE steel generated in the solution was more compact, the content of α-FeOOH in rust layer with protective effect was higher, the content of activated γ-FeOOH and β-FeOOH was little. The development process of electrochemistry parameter in the equivalent circuit was analysed, the theory of RE improving the corrosion resistance of steel was discussed.
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