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The corrosion behavior of Cu/Cr containing tube pile steel in half-immersion environment

X.Q. Liu (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Z.L. Liu (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
J.D. Hu (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Z.G. Hou (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Q.C. Tian (Baoshan Iron and Steel Company, Limited, Shanghai, China)
H.Z. Wang (Baoshan Iron and Steel Company, Limited, Shanghai, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 6 June 2016

132

Abstract

Purpose

The purpose of this study is to explore the corrosion behaviors of tube pile steel with the addition of 0.2 per cent Cu and 0.2 per cent Cu-0.2 per cent Cr in half-immersion environment.

Design/methodology/approach

The electrochemical corrosion behaviors of tube pile steel with different alloy-elements addition were identified using the polarization curve method and electrochemical impedance spectroscopy technique. Corrosion product and its morphology were analyzed by X-ray diffraction, optical microscope and scanning electron microscopy.

Findings

Results indicate that the most serious corrosion occurred in the liquid-air interface zone due to the higher oxygen and water concentration. With the addition of Cu and Cu-Cr, pits were getting smaller and denser, transforming the corrosion type from pitting corrosion to uniform corrosion gradually. Rust layer containing Cu/Cr tended to compact and inhibited the anodic process, while the enrichment of Cu/Cr in rust layer decelerated the dissolution of substrate, thus the expanding of pits was suppressed.

Originality/value

This paper studied the corrosion behaviors of liquid-air interface zone of tube pile steel and verified the transformation of corrosion type with adding Cu, Cu/Cr elements.

Keywords

Acknowledgements

This work was supported by Baoshan Iron and Steel Company, Limited.

Citation

Liu, X.Q., Liu, Z.L., Hu, J.D., Hou, Z.G., Tian, Q.C. and Wang, H.Z. (2016), "The corrosion behavior of Cu/Cr containing tube pile steel in half-immersion environment", Anti-Corrosion Methods and Materials, Vol. 63 No. 4, pp. 281-288. https://doi.org/10.1108/ACMM-10-2014-1441

Publisher

:

Emerald Group Publishing Limited

Copyright © 2016, Emerald Group Publishing Limited

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