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Study on the corrosion behaviors of high-silicon chromium iron in acidic and alkaline soil solutions

Kechen Lv (School of Materials Science and Engineering, Xiangtan University, Xiangtan, China)
Xinyu Yang (School of Materials Science and Engineering, Xiangtan University, Xiangtan, China)
Tangqing Wu (School of Materials Science and Engineering, Xiangtan University, Xiangtan, China)
Song Xu (State Grid Hunan Electric Power Corporation Research Institute, Changsha, China)
Lanlan Liu (Department of Maintenance Company, State Grid Hunan Electric Power Co. Ltd, Changsha, China)
Lin Sun (China North Advanced Technology Generalization Institute, Beijing, China)
Xinming Wang (School of Materials Science and Engineering, Xiangtan University, Xiangtan, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 13 May 2021

Issue publication date: 2 July 2021

70

Abstract

Purpose

High-silicon chromium iron (HSCI) has been used in ground grids in southern China, while there was a lack of study on its corrosion behavior in this soil environment. The purpose of this paper is to discover the corrosion of HSCI in acidic and alkaline soil solutions.

Design/methodology/approach

The original defects on the HSCI surface were observed using optical microscopy, and the corrosion behavior of the HSCI in the acidic and alkaline soil solutions were jointly detected using electrochemical measurements and scanning electron microscopy/energy dispersive spectrometer.

Findings

The results showed the corrosion rates of the HSCI in the acidic and alkaline soil solutions were limited, and the high contents of Cr and Si in matrix was responsible for its high corrosion resistance. The HSCI showed a similar corrosion tendency in the two solutions, while its corrosion rate in the acid soil solution was higher than that in the alkaline soil solution. The corrosion pits on the specimen surface were originated from the original defects in matrix, and the edges of the corrosion pits were more rounded than the original defects after 720 h immersion in the two solutions. The original defects in the HSCI matrix played a significant role in the corrosion process.

Originality/value

The paper discovered the corrosion evolution of HSCI in the acidic and alkaline soil solutions. What is more, the acceleration role of the original defects on the corrosion of the HSCI in the acidic and alkaline soil solutions was discovered in the paper. The results are beneficial for the material selection of ground grid equipment in engineering.

Keywords

Acknowledgements

Tangqing Wu was supported by National Natural Science Foundation of China (51971191, 51601164) and Hunan Provincial Natural Science Foundation of China (2019JJ30023, 2019RS2038).

Citation

Lv, K., Yang, X., Wu, T., Xu, S., Liu, L., Sun, L. and Wang, X. (2021), "Study on the corrosion behaviors of high-silicon chromium iron in acidic and alkaline soil solutions", Anti-Corrosion Methods and Materials, Vol. 68 No. 3, pp. 182-191. https://doi.org/10.1108/ACMM-08-2020-2356

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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