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Abstract <p>In this study, a micro-nano rough structure was constructed on the aluminum surface using electrochemical etching technology, and hydrophobic aluminum material was obtained through stearic acid treatment. The experiment adopted the controlled variable method to investigate the influence of electrolyte concentration, applied voltage, and etching time on wettability. Scanning electron microscopy (SEM) observations revealed that the etched structures facilitated the formation of a hydrophobic surface after stearic acid treatment. The results showed that at the condition of oxalic acid concentration of 0.3 mol/L, voltage of 40 V, and etching duration of 9 h, the substrate exhibited superhydrophobicity, with a contact angle of 162.6° ± 2°. Molecular dynamics simulations demonstrated that anodic oxidation and dissolution induced by the applied voltage led to the formation of micro-nano structures on the aluminum surface. The long-chain alkyl groups of stearic acid, which are hydrophobic, adsorbed onto the metal surface, forming a hydrophobic film that reduced surface tension and rendered the material hydrophobic.</p>

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Electrochemical Etching-Assisted Fabrication of Superhydrophobic Aluminum Coating and Molecular Dynamics Simulation Study

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Jiucong Cui,
  • Mingyang Wang,
  • Yanru Huang,
  • Guojun Cai

摘要

Abstract

In this study, a micro-nano rough structure was constructed on the aluminum surface using electrochemical etching technology, and hydrophobic aluminum material was obtained through stearic acid treatment. The experiment adopted the controlled variable method to investigate the influence of electrolyte concentration, applied voltage, and etching time on wettability. Scanning electron microscopy (SEM) observations revealed that the etched structures facilitated the formation of a hydrophobic surface after stearic acid treatment. The results showed that at the condition of oxalic acid concentration of 0.3 mol/L, voltage of 40 V, and etching duration of 9 h, the substrate exhibited superhydrophobicity, with a contact angle of 162.6° ± 2°. Molecular dynamics simulations demonstrated that anodic oxidation and dissolution induced by the applied voltage led to the formation of micro-nano structures on the aluminum surface. The long-chain alkyl groups of stearic acid, which are hydrophobic, adsorbed onto the metal surface, forming a hydrophobic film that reduced surface tension and rendered the material hydrophobic.