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Study on the corrosion mechanism of the oxide scale on hot rolled steel in an atmospheric environment

Jiaxing Cai (University of Science and Technology Beijing, Beijing, China and Nanjing Iron and Steel Co., Ltd, Nanjing, China)
Xuequn Cheng (University of Science and Technology Beijing, Beijing, China)
Baijie Zhao (Nanjing Iron and Steel Co., Ltd, Nanjing, China)
Linheng Chen (Nanjing Iron and Steel Co., Ltd, Nanjing, China)
Yi Fan (Nanjing Iron and Steel Co., Ltd, Nanjing, China)
Qinqin Dai (Nanjing Iron and Steel Co., Ltd, Nanjing, China)
Hongchi Ma (University of Science and Technology Beijing, Beijing, China)
Xiaogang Li (Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 9 August 2019

Issue publication date: 22 August 2019

Abstract

Purpose

The purpose of this paper is to understand the process of failure of scale and the corrosion resistance of scale to the substrate in an atmospheric environment.

Design/methodology/approach

The corrosion behaviour of X65 pipeline steel with different types of oxide scale was analysed using the natural environment exposure corrosion test, scanning electron microscopy analysis, electrochemical corrosion polarization curve test and other methods in a warehouse environment.

Findings

The results of this research show that one type of oxide scale, which is rough, has an uneven microstructure, and exhibits weak adhesion to the matrix, does not protect the substrate from corrosion. Conversely, the uniform, dense oxide scale, which exhibits strong adhesion to the matrix, provides effective protection to the steel. However, as the corrosion develops, the corrosion rate of the substrate tends to accelerate, especially when the structure of the oxide scale is damaged to a certain extent.

Originality/value

The corrosion mechanism of the oxide scale on hot rolled steel in an atmospheric environment has been proposed.

Keywords

Acknowledgements

The authors acknowledge the support of the National Key Research and Development Program of China (No.2016YFB0300604) and the National Natural Science Foundation of China (No. 51671028).

Citation

Cai, J., Cheng, X., Zhao, B., Chen, L., Fan, Y., Dai, Q., Ma, H. and Li, X. (2019), "Study on the corrosion mechanism of the oxide scale on hot rolled steel in an atmospheric environment", Anti-Corrosion Methods and Materials, Vol. 66 No. 5, pp. 613-620. https://doi.org/10.1108/ACMM-03-2019-2102

Publisher

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Emerald Publishing Limited

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