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Effect of rare earth lanthanum-cerium doping on corrosion behavior of zinc-aluminum-magnesium hot-dip galvanizing coatings used for transmission towers

Yu Han (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China)
Yanqiu Xia (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China)
Xin Chen (Department of Electrical Engineering and Smart Grid, Institute of New Materials and Microelectronics of State Grid, Beijing, China)
Liang Sun (Department of Electrical Engineering and Smart Grid, Institute of New Materials and Microelectronics of State Grid, Beijing, China)
Dongyu Liu (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China)
Xiangyu Ge (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 8 February 2018

Issue publication date: 23 March 2018

451

Abstract

Purpose

The purpose of this study is to improve the corrosion resistance of the transmission towers by Zinc-aluminum-magnesium (Zn-Al-Mg) coatings doped with rare earths lanthanum (La) and cerium (Ce) (denoted as Zn-Al-Mg-Re) in Q345 steel.

Design/methodology/approach

The phase structure of Zn-Al-Mg-Re composite coatings has been determined by X-ray diffraction, whereas their surface morphology and cross-sectional microstructure as well as cross-sectional elemental composition have been analyzed by scanning electron microscopy and energy-dispersive spectrometry. Moreover, the corrosion resistance of Zn-Al-Mg-Re composite coatings has been evaluated by acetic acid accelerated salt spray test of copper strip.

Findings

Experimental results show that doping with La and Ce favors to tune the composition (along with the generation of new phase, such as LaAl3 or Al11Ce3) and refine the microstructure of Zn-Al-Mg galvanizing coatings, thereby significantly improving the corrosion resistance of the coatings. Particularly, Zn-Al-Mg-Re with 0.15% (mass fraction) La exhibits the best corrosion resistance among the tested galvanizing coatings.

Originality/Value

Zinc-aluminum-magnesium (Zn-Al-Mg) coatings doped with rare earths lanthanum (La) and cerium (Ce) (denoted as Zn-Al-Mg-Re) have been prepared on Q345 steel substrate by hot-dip galvanizing so as to improve the corrosion resistance of the transmission towers, and to understand the corrosion inhibition of the Zn-Al-Mg-Re coating.

Keywords

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant 51575181).

Citation

Han, Y., Xia, Y., Chen, X., Sun, L., Liu, D. and Ge, X. (2018), "Effect of rare earth lanthanum-cerium doping on corrosion behavior of zinc-aluminum-magnesium hot-dip galvanizing coatings used for transmission towers", Anti-Corrosion Methods and Materials, Vol. 65 No. 2, pp. 131-137. https://doi.org/10.1108/ACMM-01-2017-1750

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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