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<p>The FeMnSiCrNiNb shape memory alloy/Nb composite coating (SMA/Nb coating) showed insufficient mechanical durability and corrosion resistance. Herein, a triangular armor-like micro/nanostructured superhydrophobic coating was prepared on its surface by femtosecond laser ablation coupled with hydrophobic nano-SiO<sub>2</sub> spraying. The triangular micro/nanostructures, with a depth of 51.557&#xa0;μm and a roughness of 4.323&#xa0;μm, provided an effective scaffold for nano-SiO<sub>2</sub> loading. After four spraying cycles, the coating achieved optimal superhydrophobicity, with a water contact angle of 152 ± 1° and a rolling angle of 2.3 ± 0.5°. The characteristic Si-O absorption peak at 1031.85&#xa0;cm<sup>−1</sup> verified the successful modification of nano-SiO<sub>2</sub>. The coating exhibited superior thermal and chemical stability over − 70-200&#xa0;°C and pH 1-7, and retained superhydrophobicity after 15 water-jet impacts, 50 tape-peeling cycles, and 25 wear cycles. Electrochemical tests showed that the coating significantly improved the corrosion resistance of the SMA/Nb coating, with protection efficiencies of 93.1% in 3.5&#xa0;wt.% NaCl solution and 99.1% in pH = 1 HCl solution. This strategy provides a feasible approach for fabricating high-performance superhydrophobic coatings on shape memory alloy (SMA)-based coatings.</p>

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Engineering of Armor-Like Superhydrophobic Surfaces with Shape Memory Alloy Coating: Evaluation of Corrosion and Wear Resistance Performance

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Hongli Lu,
  • Peng Xu,
  • Xingyou Zuo,
  • Qi Zhang,
  • Ling Wang

摘要

The FeMnSiCrNiNb shape memory alloy/Nb composite coating (SMA/Nb coating) showed insufficient mechanical durability and corrosion resistance. Herein, a triangular armor-like micro/nanostructured superhydrophobic coating was prepared on its surface by femtosecond laser ablation coupled with hydrophobic nano-SiO2 spraying. The triangular micro/nanostructures, with a depth of 51.557 μm and a roughness of 4.323 μm, provided an effective scaffold for nano-SiO2 loading. After four spraying cycles, the coating achieved optimal superhydrophobicity, with a water contact angle of 152 ± 1° and a rolling angle of 2.3 ± 0.5°. The characteristic Si-O absorption peak at 1031.85 cm−1 verified the successful modification of nano-SiO2. The coating exhibited superior thermal and chemical stability over − 70-200 °C and pH 1-7, and retained superhydrophobicity after 15 water-jet impacts, 50 tape-peeling cycles, and 25 wear cycles. Electrochemical tests showed that the coating significantly improved the corrosion resistance of the SMA/Nb coating, with protection efficiencies of 93.1% in 3.5 wt.% NaCl solution and 99.1% in pH = 1 HCl solution. This strategy provides a feasible approach for fabricating high-performance superhydrophobic coatings on shape memory alloy (SMA)-based coatings.