Volume 74, Issue 5 pp. 709-723
ARTICLE

Corrosion behavior and kinetics model of rare earth low-alloy steel in a soil simulation solution

Jinling Zhang

Corresponding Author

Jinling Zhang

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, China

Correspondence Jinling Zhang, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.

Email: [email protected]

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Yuanneng Dong

Yuanneng Dong

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, China

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Cong Ding

Cong Ding

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, China

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Yanchong Yu

Yanchong Yu

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, China

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Shebin Wang

Shebin Wang

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, China

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First published: 27 December 2022
Citations: 1

Abstract

The corrosion behavior of rare earth (RE) low-alloy steel in soil simulation solution was investigated by immersion test, electrochemical experiment, scanning electron microscopy, and X-ray diffraction, compared with Q450 weathering steel. The kinetics model of all steels in soil simulation solution was established. The pitting corrosion mechanism of nonmetallic and RE inclusions was discussed. The results revealed that the RE improved the corrosion resistance of low-alloy steel by modifying inclusions and promoting the formation of a dense protective film. The steel containing 0.0047% RE achieved the best corrosion resistance. The corrosion product layers were mainly composed of γ-FeOOH, α-FeOOH, Fe3O4, and Fe(OH)3. The results of the kinetic model showed that the dissolution of the anode was the restricted link of the whole process. The lowest apparent corrosion rate constant k of the sample containing 0.0047% RE was 2.359 × 10−4 μm/h in the soil simulation solution. The kinetic model could serve as a method to predict the service life of steel parts.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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