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<p>The nanosecond pulsed laser was used to clean the anodic oxide film on 7075 aluminum alloy surfaces. The effects of laser scanning speeds (0–8000&#xa0;mm/s) on surface morphology, roughness, and composition were investigated. Furthermore, the wettability and corrosion resistance of the 7075 aluminum surface before and after cleaning were also studied. Results show that at 6000&#xa0;mm/s, the cleaning depth approached the original oxide film thickness (4&#xa0;μm), with a surface roughness of 0.345&#xa0;μm. Moreover, the surface exhibited slight melting, effective oxide removal, and the appearance of a high-strength Al<sup>0+</sup> matrix sub-peak alongside the Al<sup>3+</sup> oxide sub-peak. Post-cleaning, the static contact angle reached 134.15°, indicating enhanced hydrophobicity. In environments with pH = 2, 7, and 12, the self-corrosion potential shifted positively by 0.062&#xa0;eV, 0.068&#xa0;eV, and 0.031&#xa0;eV, respectively, while charge transfer resistance (Rct) increased by 71.91%, 29.67%, and 62.61%. These electrochemical improvements (particularly the 71.91% Rct enhancement in acidic medium) confirm the strengthened corrosion resistance, enabling feasible reuse of cleaned aluminum alloys.</p>

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Effect of Scanning Speed on Surface Quality and Corrosion Resistance of 7075 Aluminum Alloy in Laser Cleaning

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Wei Wang,
  • Junyuan Kou,
  • Jiaxing Zhong,
  • Wei Wang,
  • Weijun Liu,
  • Hongyou Bian,
  • Fei Xing

摘要

The nanosecond pulsed laser was used to clean the anodic oxide film on 7075 aluminum alloy surfaces. The effects of laser scanning speeds (0–8000 mm/s) on surface morphology, roughness, and composition were investigated. Furthermore, the wettability and corrosion resistance of the 7075 aluminum surface before and after cleaning were also studied. Results show that at 6000 mm/s, the cleaning depth approached the original oxide film thickness (4 μm), with a surface roughness of 0.345 μm. Moreover, the surface exhibited slight melting, effective oxide removal, and the appearance of a high-strength Al0+ matrix sub-peak alongside the Al3+ oxide sub-peak. Post-cleaning, the static contact angle reached 134.15°, indicating enhanced hydrophobicity. In environments with pH = 2, 7, and 12, the self-corrosion potential shifted positively by 0.062 eV, 0.068 eV, and 0.031 eV, respectively, while charge transfer resistance (Rct) increased by 71.91%, 29.67%, and 62.61%. These electrochemical improvements (particularly the 71.91% Rct enhancement in acidic medium) confirm the strengthened corrosion resistance, enabling feasible reuse of cleaned aluminum alloys.