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<p>A composite coating of branched polyethylenimine (BPEI) and urushiol was fabricated on magnesium alloy via layer-by-layer self-assembly to improve corrosion resistance. The coating’s morphology and composition were characterized by SEM, EDS, and FT-IR, revealing a uniform, dense structure. Hydrophobicity was confirmed by water contact angle measurements. Electrochemical tests showed the coating significantly enhanced corrosion resistance: corrosion current density (<i>I</i><sub>corr</sub>) decreased by three orders of magnitude (1.666 × 10<sup>−7</sup>&#xa0;A&#xa0;cm<sup>−2</sup>), corrosion potential (<i>E</i><sub>corr</sub>) shifted positively by ~ 0.12&#xa0;V (− 1.386&#xa0;V), and charge transfer resistance (<i>R</i><sub>ct</sub>) increased to 19,247&#xa0;Ω&#xa0;cm<sup>2</sup>. The coating acts as an effective physical barrier, demonstrating the potential of this method for magnesium alloy protection.</p>

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Hydrophobic layer-by-layer assembled urushiol-based nanofilms for enhanced corrosion resistance of Mg alloys

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Yuhang Dai,
  • Zhenghao Li,
  • Jianlei Sun,
  • Yubo Liu,
  • Yuqing Pan,
  • Xiangde Lin,
  • Jing Cheng

摘要

A composite coating of branched polyethylenimine (BPEI) and urushiol was fabricated on magnesium alloy via layer-by-layer self-assembly to improve corrosion resistance. The coating’s morphology and composition were characterized by SEM, EDS, and FT-IR, revealing a uniform, dense structure. Hydrophobicity was confirmed by water contact angle measurements. Electrochemical tests showed the coating significantly enhanced corrosion resistance: corrosion current density (Icorr) decreased by three orders of magnitude (1.666 × 10−7 A cm−2), corrosion potential (Ecorr) shifted positively by ~ 0.12 V (− 1.386 V), and charge transfer resistance (Rct) increased to 19,247 Ω cm2. The coating acts as an effective physical barrier, demonstrating the potential of this method for magnesium alloy protection.