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Effect of Mg on the Corrosion Resistance of Hot-Dip Zn-Cu-Ti Alloy

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Abstract

The effects of Mg additions (0, 0.1, 0.2, 0.3 and 0.4 wt.%) on the microstructure and the corrosion resistance of Zn-1.5Cu-0.2Ti (ZCT) coatings are investigated, to formulate an aluminum-free and highly corrosion-resistant hot-dip galvanization-based alloy for structural components. The microstructure of the plating and the morphology of the corrosion products are characterized by SEM and EDS. The phase composition of coatings and corrosion products is examined by XRD. The corrosion resistance of the coatings with different Mg contents is evaluated by a neutral salt spray test and polarization curves. The results indicate that adding Mg can refine the surface grains of the coating and enhance the formation of the TiZn16 phase at the grain boundaries of the ZCT coating, thereby enhancing the corrosion resistance at these boundaries. The neutral salt spray test indicates the addition of Mg significantly suppresses the grain boundary corrosion and the plating is dominated by uniform corrosion. In addition, the addition of Mg enhances the densification and stability of the corrosion products. The neutral salt spray test and polarization curves reveal that the presence of Mg enhances the corrosion resistance of ZCT coatings, with ZCT-0.3 Mg coatings exhibiting the highest level of corrosion resistance. This study is of great significance for improving the service life and coating quality of structural components.

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Acknowledgments

This research was supported by the Major Science and Technology Special Project of Yunnan Province (Approval No. 202202AG050011), the Young Top Talents Project of the “Ten Thousand People Plan” of Yunnan Province (Approval No. YNWR-QNBJ-2018-323), and the Key Research and Development Program of Hebei Province (Project No. 20311008D).

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Authors and Affiliations

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Yu Lei, Shiwei Li, Shuxuan Hu, Heng Zhang, Jiangpeng Zhang & Shaohua Yin

  2. Jiangsu Youfa Steel Pipe Co., Ltd, Liyang, 2133636, Jiangsu, China

    Hongxin Wen

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  1. Yu Lei
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  2. Shiwei Li
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  3. Hongxin Wen
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  4. Shuxuan Hu
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  5. Heng Zhang
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  6. Jiangpeng Zhang
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  7. Shaohua Yin
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Contributions

Yu Lei contributed to conceptualization, formal analysis, investigation, data curation and writing—original draft. Shiwei Li was involved in methodology, conceptualization, validation, resources and writing—review and editing. Hongxin Wen contributed to validation and writing—review. Shuxuan Hu, Heng Zhang and Jiangpeng Zhang were involved in validation. Shaohua Yin contributed to project administration, conceptualization and writing—review and editing.

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Correspondence to Shiwei Li or Shaohua Yin.

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Lei, Y., Li, S., Wen, H. et al. Effect of Mg on the Corrosion Resistance of Hot-Dip Zn-Cu-Ti Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09468-6

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  • DOI: https://doi.org/10.1007/s11665-024-09468-6

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