Abstract

Removal of a paint layer of 2024 aluminum alloy was studied using a nanosecond fiber pulsed laser with a maximum power of 30 W and the influence of laser cleaning energy density on the surface integrity of the substrate was explored. The cleaning energy density threshold of the paint layer is ${17.69}\;{{\rm J/cm}^2}$ and the damage energy density threshold is ${24.77}\;{{\rm J/cm}^2}$. The optimum cleanliness and surface integrity of laser cleaning were obtained when the energy density was ${21.23}\;{{\rm J/cm}^2}$. Microhardness and Young’s modulus of the surface after laser cleaning were improved by 6% and 25%, respectively. The mechanical properties of the surface of the substrate after laser cleaning were significantly improved, which is an advantage for this high-quality non-destructive cleaning technology of the aircraft skin surface paint layer.

© 2020 Optical Society of America

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