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<p>Systematic investigations into the individual effects of increasing alloying additions of Mg and Al on the corrosion mechanisms of Zn-Mg-Al coatings have demonstrated that microstructural phases and their surface distribution determine the anodic and cathodic behaviour of the coating. Increasing either Al and/or Mg from 1 to 3 wt.% improved the surface corrosion performance of the coating, with a greater effect observed for Al additions due to anodic deactivation. Mg additions led to cathodic deactivation due to a significant reduction in Zn dendrites at the surface. The corrosion rate was minimised by maximising the ternary eutectic area fraction at the coating surface. A 52% and 32% decrease in SVET-derived metal loss is achieved at 3 wt.% increase in Al and Mg, respectively.</p>

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Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月29日

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  • A. D. Malla,
  • G. Williams,
  • D. A. Britton,
  • F. E. Goodwin,
  • Ana P. Domingos Cardoso,
  • T. Richards,
  • D. J. Penney,
  • J. H. Sullivan

摘要

Systematic investigations into the individual effects of increasing alloying additions of Mg and Al on the corrosion mechanisms of Zn-Mg-Al coatings have demonstrated that microstructural phases and their surface distribution determine the anodic and cathodic behaviour of the coating. Increasing either Al and/or Mg from 1 to 3 wt.% improved the surface corrosion performance of the coating, with a greater effect observed for Al additions due to anodic deactivation. Mg additions led to cathodic deactivation due to a significant reduction in Zn dendrites at the surface. The corrosion rate was minimised by maximising the ternary eutectic area fraction at the coating surface. A 52% and 32% decrease in SVET-derived metal loss is achieved at 3 wt.% increase in Al and Mg, respectively.