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<p>Austenitic stainless steel faces significant risks of localized corrosion in chloride-containing media, while existing surface protection technologies exhibit limitations in practical applications. Inspired by biomimetic principles, this study employs femtosecond laser micromachining to construct controllable micro-/nanocomposite structures on the surface of 316L stainless steel, combined with heat treatment modification to achieve a superhydrophobic surface with contact angles consistently exceeding 160°, up to 166°. Electrochemical tests conducted in a 3.5 wt.% NaCl solution at 60&#xa0;°C demonstrate that the superhydrophobic surface exhibits a positive shift in corrosion potential (from − 0.501 to − 0.215&#xa0;V) and a significant increase in charge transfer resistance (from 1.31 × 104 to 2.93 × 105 Ω), corresponding to a corrosion protection efficiency of 95.5% based on <i>R</i><sub><i>ct</i></sub>. Even at elevated temperatures, the micro-/nanostructure retains partial gas-film protection, effectively mitigating corrosion. Theoretical analysis establishes a partial-wetting model for the micro-/nanocomposite structure, revealing the quantitative relationship between structural parameters and air film stability. This elucidates the physical mechanism by which surface roughness characteristics delay interfacial mass transfer to achieve corrosion protection. The research provides a new technological approach for the functional design and protection of metal surfaces in harsh corrosive environments.</p>

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Investigation on Corrosion-Protective Performance of Bioinspired Superhydrophobic Micro-/Nanostructure

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Wenqian Zhang,
  • Fei Xie,
  • Hui Zhao,
  • Hongtao Dong,
  • Po Zhang,
  • Zhe Ding,
  • Xizhao Wang

摘要

Austenitic stainless steel faces significant risks of localized corrosion in chloride-containing media, while existing surface protection technologies exhibit limitations in practical applications. Inspired by biomimetic principles, this study employs femtosecond laser micromachining to construct controllable micro-/nanocomposite structures on the surface of 316L stainless steel, combined with heat treatment modification to achieve a superhydrophobic surface with contact angles consistently exceeding 160°, up to 166°. Electrochemical tests conducted in a 3.5 wt.% NaCl solution at 60 °C demonstrate that the superhydrophobic surface exhibits a positive shift in corrosion potential (from − 0.501 to − 0.215 V) and a significant increase in charge transfer resistance (from 1.31 × 104 to 2.93 × 105 Ω), corresponding to a corrosion protection efficiency of 95.5% based on Rct. Even at elevated temperatures, the micro-/nanostructure retains partial gas-film protection, effectively mitigating corrosion. Theoretical analysis establishes a partial-wetting model for the micro-/nanocomposite structure, revealing the quantitative relationship between structural parameters and air film stability. This elucidates the physical mechanism by which surface roughness characteristics delay interfacial mass transfer to achieve corrosion protection. The research provides a new technological approach for the functional design and protection of metal surfaces in harsh corrosive environments.