Attempt to Optimize the Corrosion Resistance of HRB400 Steel Rebar with Cr and RE

Tao Liu; Nannan Li; Chao Liu; Jingshe Li; Tianyi Zhang; Xuequn Cheng; Shufeng Yang

doi:10.3390/ma15228269

Attempt to Optimize the Corrosion Resistance of HRB400 Steel Rebar with Cr and RE

Materials (Basel). 2022 Nov 21;15(22):8269. doi: 10.3390/ma15228269.

Authors

Tao Liu¹, Nannan Li^{2

3}, Chao Liu^{2

3}, Jingshe Li¹, Tianyi Zhang⁴, Xuequn Cheng^{2

3}, Shufeng Yang¹

Affiliations

¹ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
² Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
³ National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China.
⁴ School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 100096, China.

Abstract

The corrosion resistance of the HRB400 steel rebar alloyed with Cr and rare earths (RE) was systematically studied from two aspects, including the properties of the passive film and the protectiveness of the rust layer. The results presented that Cr increased the corrosion resistance of the steel rebar through stabilizing the passive film and was not involved in the formation of corrosion pits, while the pitting corrosion was initiated by the dissolution of (RE)₂O₂S inclusion, resulting in the local acidification at the bottom of the corrosion pits, which decreased the stability of the passive film. As for the long-term corrosion process, both Cr and RE decreased the corrosion rate of the steel rebar, which was related to the promotion effect on the formation of α-FeOOH in the rust layer from Cr and RE.

Keywords: Cr; HRB400 steel rebar; RE; corrosion resistance.

Grants and funding

This research was funded by the National Natural Science Foundation of China (No. 52104319) and the National Science and Technology Resources Investigation Program of China (No. 2019FY101400).