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<p>Micro-arc oxidation (MAO) film can only provide common mechanical protection for magnesium (Mg)–lithium (Li) alloys. These alloys are susceptible to severe localized corrosion, if the MAO film is disrupted. This work reports the successful hydrothermal preparation of a MgLiAlCe-LDHs@GO film on a MAO-coated Mg–Li alloy following Ce confinement. The graphene oxide (GO) sheet increased the diffusion path of the corrosive media, and the addition of rare-earth cerium ions (Ce<sup>3+</sup>) endowed the film with a certain self-healing ability, which significantly improved the corrosion resistance of the film, and the corrosion current density (<i>i</i><sub>corr</sub>) reached 3.27 × 10<sup>−8</sup>&#xa0;A&#xa0;cm<sup>−2</sup>. The synergistic action of GO and Ce<sup>3+</sup> can achieve long-term corrosion protection for the substrate. The corrosion resistance mechanism of MgLiAlCe-LDHs@GO film was discussed by the scanning vibration electrode technique (SVET).</p>

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Preparation and Corrosion Resistance Mechanism of Magnesium–Lithium Alloy Micro-arc Oxidation/Quaternary LDHs@GO Self-healing Composite Film

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Zhenzhen Tian,
  • Rongqian Wu,
  • Fubing Yu,
  • Yan Zhou,
  • Wenhui Yao,
  • Yuan Yuan,
  • Zhihui Xie,
  • Yanlong Ma,
  • Atrens Andrej,
  • Liang Wu

摘要

Micro-arc oxidation (MAO) film can only provide common mechanical protection for magnesium (Mg)–lithium (Li) alloys. These alloys are susceptible to severe localized corrosion, if the MAO film is disrupted. This work reports the successful hydrothermal preparation of a MgLiAlCe-LDHs@GO film on a MAO-coated Mg–Li alloy following Ce confinement. The graphene oxide (GO) sheet increased the diffusion path of the corrosive media, and the addition of rare-earth cerium ions (Ce3+) endowed the film with a certain self-healing ability, which significantly improved the corrosion resistance of the film, and the corrosion current density (icorr) reached 3.27 × 10−8 A cm−2. The synergistic action of GO and Ce3+ can achieve long-term corrosion protection for the substrate. The corrosion resistance mechanism of MgLiAlCe-LDHs@GO film was discussed by the scanning vibration electrode technique (SVET).