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<p>This study innovatively employs femtosecond pulse laser (pulse width 294&#xa0;fs, repetition frequency 300&#xa0;kHz) for precise removal of surface coatings on aviation-grade 7075 aluminium alloy, achieving synergistic control over coating removal, surface modification, and performance optimization through systematic regulation of laser power parameters (11.9&#xa0;W to 23.81&#xa0;W). At a power setting of 16.67&#xa0;W, the surface morphology and chemical composition of the cleaned specimen closely resemble those of the untreated 7075 aluminium alloy surface, with the surface inducing a grating structure that enhances the specimen’s adhesion to liquids, resulting in a wettability angle increase to 85(± 2)°. The microhardness increased to 178.65 HV<sub>0.2</sub> with rising power. As the power increased, the hardness of the specimen’s surface gradually improved, exhibiting good hydrophilicity; however, this had a negative impact on surface roughness and corrosion resistance. The findings of this paper provide technical support and practical guidance for the industrial application of laser coating removal technology in the aviation sector.</p>

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Effect of femtosecond laser power on the removal mechanism and surface properties of surface paint layer on 7075 aluminium alloy

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Yaoqi Chang,
  • Weijun Liu,
  • Kai Zhang,
  • Wei Wang,
  • Qiang Li,
  • Huiru Wang,
  • Hongyou Bian

摘要

This study innovatively employs femtosecond pulse laser (pulse width 294 fs, repetition frequency 300 kHz) for precise removal of surface coatings on aviation-grade 7075 aluminium alloy, achieving synergistic control over coating removal, surface modification, and performance optimization through systematic regulation of laser power parameters (11.9 W to 23.81 W). At a power setting of 16.67 W, the surface morphology and chemical composition of the cleaned specimen closely resemble those of the untreated 7075 aluminium alloy surface, with the surface inducing a grating structure that enhances the specimen’s adhesion to liquids, resulting in a wettability angle increase to 85(± 2)°. The microhardness increased to 178.65 HV0.2 with rising power. As the power increased, the hardness of the specimen’s surface gradually improved, exhibiting good hydrophilicity; however, this had a negative impact on surface roughness and corrosion resistance. The findings of this paper provide technical support and practical guidance for the industrial application of laser coating removal technology in the aviation sector.