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How solute atoms control aqueous corrosion of Al-alloys

Author

Listed:
  • Huan Zhao

    (Max-Planck-Institut für Eisenforschung
    Xi’an Jiaotong University)

  • Yue Yin

    (Max-Planck-Institut für Eisenforschung)

  • Yuxiang Wu

    (Max-Planck-Institut für Eisenforschung)

  • Siyuan Zhang

    (Max-Planck-Institut für Eisenforschung)

  • Andrea M. Mingers

    (Max-Planck-Institut für Eisenforschung)

  • Dirk Ponge

    (Max-Planck-Institut für Eisenforschung)

  • Baptiste Gault

    (Max-Planck-Institut für Eisenforschung
    Imperial College London)

  • Michael Rohwerder

    (Max-Planck-Institut für Eisenforschung)

  • Dierk Raabe

    (Max-Planck-Institut für Eisenforschung)

Abstract

Aluminum alloys play an important role in circular metallurgy due to their good recyclability and 95% energy gain when made from scrap. Their low density and high strength translate linearly to lower greenhouse gas emissions in transportation, and their excellent corrosion resistance enhances product longevity. The durability of Al alloys stems from the dense barrier oxide film strongly bonded to the surface, preventing further degradation. However, despite decades of research, the individual elemental reactions and their influence on the nanoscale characteristics of the oxide film during corrosion in multicomponent Al alloys remain unresolved questions. Here, we build up a direct correlation between the near-atomistic picture of the corrosion oxide film and the solute reactivity in the aqueous corrosion of a high-strength Al-Zn-Mg-Cu alloy. We reveal the formation of nanocrystalline Al oxide and highlight the solute partitioning between the oxide and the matrix and segregation to the internal interface. The sharp decrease in partitioning content of Mg in the peak-aged alloy emphasizes the impact of heat treatment on the oxide stability and corrosion kinetics. Through H isotopic labelling with deuterium, we provide direct evidence that the oxide acts as a trap for this element, pointing at the essential role of the Al oxide might act as a kinetic barrier in preventing H embrittlement. Our findings advance the mechanistic understanding of further improving the stability of Al oxide, guiding the design of corrosion-resistant alloys for potential applications.

Suggested Citation

  • Huan Zhao & Yue Yin & Yuxiang Wu & Siyuan Zhang & Andrea M. Mingers & Dirk Ponge & Baptiste Gault & Michael Rohwerder & Dierk Raabe, 2024. "How solute atoms control aqueous corrosion of Al-alloys," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-44802-5
    DOI: 10.1038/s41467-024-44802-5
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    References listed on IDEAS

    as
    1. Stuart Lyon, 2004. "A natural solution to corrosion?," Nature, Nature, vol. 427(6973), pages 406-407, January.
    2. Martí López Freixes & Xuyang Zhou & Huan Zhao & Hélène Godin & Lionel Peguet & Timothy Warner & Baptiste Gault, 2022. "Revisiting stress-corrosion cracking and hydrogen embrittlement in 7xxx-Al alloys at the near-atomic-scale," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Huan Zhao & Poulami Chakraborty & Dirk Ponge & Tilmann Hickel & Binhan Sun & Chun-Hung Wu & Baptiste Gault & Dierk Raabe, 2022. "Hydrogen trapping and embrittlement in high-strength Al alloys," Nature, Nature, vol. 602(7897), pages 437-441, February.
    4. Xiaogang Li & Dawei Zhang & Zhiyong Liu & Zhong Li & Cuiwei Du & Chaofang Dong, 2015. "Materials science: Share corrosion data," Nature, Nature, vol. 527(7579), pages 441-442, November.
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