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<p>The physicochemical properties of SUS304 foil surfaces are crucial to their applications. Pulsed laser modification was applied to 30&#xa0;μm thick SUS304 foils to systematically investigate the influence of laser energy on surface characteristics. Through multidimensional characterization of surface morphology, three-dimensional profiles and roughness, contact angle, and chemical composition, the structure–function correlation between laser energy and the physicochemical properties of steel surface was revealed. With increasing laser energy, the surface morphology of the steel transitions from a directional rolling-marked structure to a uniform sponge-like isotropic structure, accompanied by increased peak density and an expanded interfacial area. Additionally, the chemical state on the metal surface gradually stabilizes from unstable redox reactions, forming a stable oxide layer and significantly increasing active hydroxyl groups, thereby effectively improving surface wettability. Single lap shear tests reveal an enhancement in the bonding strength of steel/carbon fiber reinforced composites joints after laser modification, which is attributed to the synergistic effects of mechanical interlocking, enhanced wettability, and chemical bonding at the interface. The demonstrated potential of laser surface treatment for modifying SUS304 ultra-thin foils provides theoretical support and technical reference for its application in fiber metal laminates.</p>

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Physicochemical co-evolution of SUS304 ultra-thin steel foils induced by laser and its effect on interface bonding of steel/CFRP joints

  • 期刊论文

  • 发表日期：

    2026年2月8日

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  • Lei Chen,
  • Shi-Yu Li,
  • Shao-Yu Zhu,
  • Tao Wang,
  • Qing-Xue Huang

摘要

The physicochemical properties of SUS304 foil surfaces are crucial to their applications. Pulsed laser modification was applied to 30 μm thick SUS304 foils to systematically investigate the influence of laser energy on surface characteristics. Through multidimensional characterization of surface morphology, three-dimensional profiles and roughness, contact angle, and chemical composition, the structure–function correlation between laser energy and the physicochemical properties of steel surface was revealed. With increasing laser energy, the surface morphology of the steel transitions from a directional rolling-marked structure to a uniform sponge-like isotropic structure, accompanied by increased peak density and an expanded interfacial area. Additionally, the chemical state on the metal surface gradually stabilizes from unstable redox reactions, forming a stable oxide layer and significantly increasing active hydroxyl groups, thereby effectively improving surface wettability. Single lap shear tests reveal an enhancement in the bonding strength of steel/carbon fiber reinforced composites joints after laser modification, which is attributed to the synergistic effects of mechanical interlocking, enhanced wettability, and chemical bonding at the interface. The demonstrated potential of laser surface treatment for modifying SUS304 ultra-thin foils provides theoretical support and technical reference for its application in fiber metal laminates.