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<p>This study proposes a novel, cost-effective multilayer coating system, composed of a hydrothermal conversion layer and an outer beeswax layer to enhance the corrosion resistance of pure Mg. The hydrothermal + beeswax-coated Mg specimen was characterized using SEM, XRD, FT-IR, and electrochemical techniques. The results demonstrate that the multilayer coating provides durable protection, exhibiting unique synergistic properties. The coating provides the outstanding long-term protection evidenced by a corrosion rate of 0.02&#xa0;mm/y in 3.5&#xa0;wt.% NaCl solution, which is orders of magnitude lower than many conventional coatings. It also exhibits exceptional thermal-repairing capabilities with complete self-healing achieved at temperatures of 60 to 70&#xa0;°C, and robust hydrophobicity demonstrated by a water contact angle of approximately 110°. This coating presents an achievement in low-cost, high-performance protection for magnesium alloys.</p>

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A Novel Thermal-Repairing Multilayer Coating on Magnesium for Corrosion Protection

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Jiahao Zeng,
  • Tong Bu,
  • Ruijie Jia,
  • Fuyong Cao

摘要

This study proposes a novel, cost-effective multilayer coating system, composed of a hydrothermal conversion layer and an outer beeswax layer to enhance the corrosion resistance of pure Mg. The hydrothermal + beeswax-coated Mg specimen was characterized using SEM, XRD, FT-IR, and electrochemical techniques. The results demonstrate that the multilayer coating provides durable protection, exhibiting unique synergistic properties. The coating provides the outstanding long-term protection evidenced by a corrosion rate of 0.02 mm/y in 3.5 wt.% NaCl solution, which is orders of magnitude lower than many conventional coatings. It also exhibits exceptional thermal-repairing capabilities with complete self-healing achieved at temperatures of 60 to 70 °C, and robust hydrophobicity demonstrated by a water contact angle of approximately 110°. This coating presents an achievement in low-cost, high-performance protection for magnesium alloys.