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<p>AZ31 magnesium alloy has found widespread applications in engineering and functional materials for the automobile, aerospace, electronics, and biomedical industries due to its low density and high specific strength. However, it is highly susceptible to corrosion, and the development of new anticorrosion coatings on the Mg alloy surface is urgently needed. In this study, an inorganic–organic dual-layer coating Mg(OH)<sub>2</sub>/KH550 was fabricated on AZ31 alloy by hydrothermal treatment followed by silane modification to improve corrosion resistance and hydrophobicity. The effect of KH550 concentration was investigated. The 9&#xa0;wt.% concentration provided the best performance. SEM, EDX, AFM, XRD, water contact angle, and electrochemical tests in 3.5% NaCl were used to evaluate surface morphology, composition, roughness, and corrosion resistance. The optimized coating exhibited a uniform and compact surface with strong interfacial bonding through Mg-O-Si linkages. The contact angle increased to 100.6° ± 3.1, and surface energy dropped to 14.0&#xa0;mJ/m<sup>2</sup>, which enhanced hydrophobicity. Electrochemical tests revealed a significant decrease in corrosion current density (<i>i</i><sub>corr</sub>) from 2.80 × 10<sup>−5</sup>&#xa0;A/cm<sup>2</sup> (bare alloy) to 2.38 × 10<sup>−7</sup>&#xa0;A/cm<sup>2</sup> (coated). The pitting area was reduced by about 97.5%. This coating method is low cost, simple, and effective in improving corrosion protection; it can also serve as a primer for additional functional coatings.</p> Graphical abstract <p></p>

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Sustainable Mg(OH)2/KH550 dual-layer coating on AZ31 alloy with improved corrosion resistance and surface hydrophobicity

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Zainab Sabah Abbas,
  • Hassan Abdulrssoul Abdulhadi,
  • Nabil Kadhim Taieh,
  • Ying Li,
  • Hanaa Soliman,
  • Xian Jian,
  • Guangjun Gou,
  • Xiaoli Xie,
  • Xi Liu

摘要

AZ31 magnesium alloy has found widespread applications in engineering and functional materials for the automobile, aerospace, electronics, and biomedical industries due to its low density and high specific strength. However, it is highly susceptible to corrosion, and the development of new anticorrosion coatings on the Mg alloy surface is urgently needed. In this study, an inorganic–organic dual-layer coating Mg(OH)2/KH550 was fabricated on AZ31 alloy by hydrothermal treatment followed by silane modification to improve corrosion resistance and hydrophobicity. The effect of KH550 concentration was investigated. The 9 wt.% concentration provided the best performance. SEM, EDX, AFM, XRD, water contact angle, and electrochemical tests in 3.5% NaCl were used to evaluate surface morphology, composition, roughness, and corrosion resistance. The optimized coating exhibited a uniform and compact surface with strong interfacial bonding through Mg-O-Si linkages. The contact angle increased to 100.6° ± 3.1, and surface energy dropped to 14.0 mJ/m2, which enhanced hydrophobicity. Electrochemical tests revealed a significant decrease in corrosion current density (icorr) from 2.80 × 10−5 A/cm2 (bare alloy) to 2.38 × 10−7 A/cm2 (coated). The pitting area was reduced by about 97.5%. This coating method is low cost, simple, and effective in improving corrosion protection; it can also serve as a primer for additional functional coatings.

Graphical abstract