Process and Mechanism of Laser Removal of Paint on 2024 Aluminum Alloy
LIU Pengfei1,2, WANG Sijie2, YIN Fengshi3, SHAN Teng1,2, QIAO Yulin2
1 School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China 2 National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China 3 School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China
Abstract: Laser paint removal has the advantages of wide application range, high precision, no damage and no pollution, and has great development potential. Research on the laser removal of 2024 aluminum alloy surface commonly used in aircraft skin is helpful to expand the application of this technology in the field of aviation remanufacturing. In this work, we carried out laser depainting experiments on the surface of 2024 aluminum alloy at different laser energy densities and scanning speeds through nanosecond pulse laser cleaning equipment. The results show that the laser energy density and scanning speed have a great influence on the cleaning surface quality. When the scanning speed is 50 cm2/s and the energy density is 16.5 J/cm2, the best effect of laser clearing was got. When the energy density is greater than 21.22 J/cm2, the paint damage threshold was reached. With the increase of laser energy density or the decrease of scanning speed, the paint removal rate increases gradually. The mechanical properties of the paint removal surface are better than that of the matrix, and the microhardness and elastic modulus are improved. In addition, we also analyzed the paint removal mechanism at different scanning speeds by SEM and EDS. According to our research results, by adjusting the laser energy density and scanning speed, it is possible to improve the efficiency of paint removal while avoiding damage to the substrate, which is beneficial to recoating the aircraft skin after paint removal.
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2020, Vol. 34 
