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<p>AZ31 magnesium alloys are lightweight substitutes for aluminum and steel, but they are prone to rapid corrosion in a chloride environment, which lowers their service life and increases their overall maintenance requirements. This study presents a cost-effective method for preparing a corrosion-resistant superhydrophobic (SHP) composite coating using a green two-step hydrothermal method and subsequent immersion surface modification. The coating consists of Mg(OH)<sub>2</sub>, KH550, and myristic acid. It exhibited strong superhydrophobic properties, with a high-water contact angle (CA) of 163.9° ± 2.2° and a low sliding angle (SA) of 5.1° ± 1.1°. The corrosion current density (i<sub>corr</sub>) decreased from 3.05 × 10<sup>–5</sup> to 1.54 × 10<sup>–8</sup> /cm<sup>2</sup>, representing a three-order reduction. The pitting corrosion area was reduced by 99.7% and charge transfer resistance (R<sub>ct</sub>) increased to 1.59 × 10<sup>5</sup>&#xa0;Ω&#xa0;cm<sup>2</sup>. The coating exhibited hydrophobicity after 1100&#xa0;mm of abrasion and after 20&#xa0;days of water immersion, indicating that the coating had high mechanical and chemical stability. This suggests that the coating has a stable, long-term corrosion protection ability suitable for use on marine structures, automotive, and aerospace components that will be exposed to severe environments.</p> Graphical Abstract <p></p>

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Eco-Friendly Fabrication of a Superhydrophobic KH550–Myristic Acid Coating on AZ31 Alloy with Corrosion Resistance and Self-Cleaning Ability

  • 期刊论文

  • 发表日期：

    2026年2月26日

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

摘要

AZ31 magnesium alloys are lightweight substitutes for aluminum and steel, but they are prone to rapid corrosion in a chloride environment, which lowers their service life and increases their overall maintenance requirements. This study presents a cost-effective method for preparing a corrosion-resistant superhydrophobic (SHP) composite coating using a green two-step hydrothermal method and subsequent immersion surface modification. The coating consists of Mg(OH)2, KH550, and myristic acid. It exhibited strong superhydrophobic properties, with a high-water contact angle (CA) of 163.9° ± 2.2° and a low sliding angle (SA) of 5.1° ± 1.1°. The corrosion current density (icorr) decreased from 3.05 × 10–5 to 1.54 × 10–8 /cm2, representing a three-order reduction. The pitting corrosion area was reduced by 99.7% and charge transfer resistance (Rct) increased to 1.59 × 105 Ω cm2. The coating exhibited hydrophobicity after 1100 mm of abrasion and after 20 days of water immersion, indicating that the coating had high mechanical and chemical stability. This suggests that the coating has a stable, long-term corrosion protection ability suitable for use on marine structures, automotive, and aerospace components that will be exposed to severe environments.

Graphical Abstract