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Corrosion mechanism of a new-type low-alloy corrosion resistant steel containing Sb used in acid environment

Ying Yang (Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, China)
Wei Wu (Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, China)
Xuequn Cheng (Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, China)
Jinbin Zhao (Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, China and Research Institute, NanJing Iron and Steel Co., LTD., Nanjing, China)
Baijie Zhaoal (Research Institute, Nanjing Iron and Steel Co., LTD., Nanjing, China)
Xiaogang Li (Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 22 February 2021

Issue publication date: 25 May 2021

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Abstract

Purpose

This study aims to develops a new-type low-alloy corrosion resistant steel containing Sb and investigate the corrosion mechanism of this new-type low-alloy steel.

Design/methodology/approach

Energy dispersive spectrometer, X-ray photoelectron spectroscopy, X-Ray diffraction and scanning electron microscopy were used to evaluate the corrosion resistance of the rust layers formed on these samples. Laser confocal microscopy was used to observe the corroded surfaces of the steels.

Findings

Results showed that Sb added can consume H+ in the solution, thereby preventing the oxygen reaction to slow down the corrosion rate. Meanwhile, a stable and insoluble substance (Sb2O3) in the acidic solution would be produced when the reaction of the product of Sb and H+ with the enough dissolved oxygen in the solution. Due to the precipitation of Sb2O3 and iron oxyhydroxides, the rust layer of Sb-containing steel became more uniform and compact, which resulted in better corrosion resistance in acid environment.

Originality/value

In this study, a new-type acid resistant low-alloy steel containing Sb was developed. Compared with the results, the corrosion mechanism of the new-type low-alloy steel in acid environment was discussed.

Keywords

Acknowledgements

The authors acknowledge the support of the National Natural Science Foundation of China (No. 51871024) and the Fundamental Research Funds for the Central Universities(No.FRF-IP-19–005).

Citation

Yang, Y., Wu, W., Cheng, X., Zhao, J., Zhaoal, B. and Li, X. (2021), "Corrosion mechanism of a new-type low-alloy corrosion resistant steel containing Sb used in acid environment", Anti-Corrosion Methods and Materials, Vol. 68 No. 2, pp. 85-94. https://doi.org/10.1108/ACMM-09-2020-2378

Publisher

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Emerald Publishing Limited

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