2024铝合金表面激光除漆工艺及机理

doi:10.11896/cldb.19120234

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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.

Key words： laser cleaning scanning speed roughness surface topography energy density

Published: 24 December 2020

CLC number:

TN249

Fund:This work was financially supported by National Natural Science Foundation of China (51805541) and 2018 National Key R&D Plan (2018YFB0407401).

About author:: Pengfei Liu received his master′s degree from Shandong University of Technology in 2020. In March 2019, he studied in the Army Academy of Armored Force, mainly engaged in laser cleaning and surface physical metallurgy.
Sijie Wang received his Ph.D. degree in materials processing engineering from the Army Academy of Armored Force in December 2012. In the same year, he joined the National Engineering Research Center for Remanufacturing of Mechanical Products in the Department of Equipment Support and Remanufacturing of the Army Academy of Armored Force, and has been mainly engaged in surface engineering and laser processing technology.

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	LIU Pengfei
	WANG Sijie
	YIN Fengshi
	SHAN Teng
	QIAO Yulin

Cite this article:

LIU Pengfei,WANG Sijie,YIN Fengshi, et al. Process and Mechanism of Laser Removal of Paint on 2024 Aluminum Alloy[J]. Materials Reports, 2020, 34(24): 24121-24126.

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http://www.mater-rep.com/EN/10.11896/cldb.19120234 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24121

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