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Corrosion mechanism of Zn–Al–Mg-coated steel in simulated polluted marine atmosphere

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Abstract

The corrosion behaviour of zinc–aluminium–magnesium-coated steel in a simulated polluted marine atmospheric environment was investigated. Therefore, an indoor ageing acceleration test was carefully designed by simulating a polluted marine environment. The objective was to in-depth investigate the corrosion mechanism of Zn–Al–Mg-coated steel exposed to a simulated polluted marine environment. The experiments were carried out by scanning electron microscopy for micro-morphological characterization, X-ray diffraction, electrochemical impedance spectroscopy and electrodynamic polarization curves for the aged samples. The analysis of the results obtained after an indoor accelerated ageing test shows that Zn–Al–Mg coatings generate insoluble Zn5Cl2(OH)8·H2O and Zn4SO4(OH)6 during the corrosion process, which hinders the diffusion of corrosive substances into the substrate, and the insoluble substances are structurally dense and thus inhibit further corrosion. Therefore, this effectively inhibits the occurrence of further corrosion, and thus, Zn–Al–Mg coating can significantly extend the service life of Zn–Al–Mg-coated steel.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0304602), the National Natural Science Foundation of China (Nos. 51771029) and the National Environmental Corrosion Platform (NECP, 2005DKA10400).

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Authors and Affiliations

  1. Research Institute, JISCO Hongxing Iron and Steel Co., Ltd., Jiayuguan, 735100, Gansu, China

    Pei-dong Ning & Jin Wang

  2. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Li-yuan Xiao, Qian-qian Liu & Kui Xiao

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  1. Pei-dong Ning
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  2. Li-yuan Xiao
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  3. Jin Wang
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  4. Qian-qian Liu
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Correspondence to Kui Xiao.

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There is no conflict of interest in the submission of this manuscript, and the manuscript is approved by all authors for publication. I would like to declare on behalf of my coauthors that the work described is original research that has not been published previously and is not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the enclosed manuscript.

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Ning, Pd., Xiao, Ly., Wang, J. et al. Corrosion mechanism of Zn–Al–Mg-coated steel in simulated polluted marine atmosphere. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-024-01210-9

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  • DOI: https://doi.org/10.1007/s42243-024-01210-9

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