Chinese Journal of Lasers, Volume. 51, Issue 16, 1602209(2024)
Simulation and Experimental Study on Laser Cleaning of Surface Paint Layer of Aluminum Alloy Skin for Civil Aircraft
Figures & Tables(27)
Fig. 1. Cross-section OM topography and diagram of composite paint layer. (a) OM topography; (b) diagram
Fig. 3. Schematics of laser processing. (a) Spot for single-pulse paint removal; (b) paint removal path by multi-pulse surface scanning
Fig. 8. Temperature and thermal stress field cloud maps for paint removal surface at t=750 ns. (a) Temperature field cloud map; (b) thermal stress field cloud map
Fig. 11. Stress-strain test results of acrylic polyurethane paint. (a) Tensile test curve; (b) compression test curve
Fig. 13. Comparison result of cross-section profile and SEM morphology of single-pulse laser paint removal crater surface. (a) SEM morphology of crater surface; (b) comparison result of cross-section profile
Fig. 14. Mechanism of single-pulse laser paint removal. (a) Irradiation and gasification; (b) ablation and plasma cleaning; (c) thermal stress effect
Fig. 15. OM morphology of paint removal surface by multi-pulse surface scanning laser at different scanning speeds. (a)(b) ν=1000 mm/s; (c)(d) ν=900 mm/s; (e)(f) ν=800 mm/s; (g)(h) ν=700 mm/s
Fig. 16. Comparison of theoretical and experimental laser irradiated areas at different scanning speeds. (a) ν=1000 mm/s; (b) ν=900 mm/s; (c) ν=800 mm/s; (d) ν=700 mm/s
Fig. 17. Backscatter SEM microscopic morphology of surface after paint removal at different scanning speeds. (a)(b) ν=1000 mm/s; (c)(d) ν=900 mm/s; (e)(f) ν=800 mm/s; (g)(h) ν=700 mm/s
Table 1. Chemical compositions of LY12 aluminum alloy
View tableTable 1. Chemical compositions of LY12 aluminum alloy
Element Si Fe Cu Mn Mg Cr Zn Ti Al Mass fraction /% 0.06 0.18 4.73 0.63 1.65 0.02 0.22 0.04 Bal.
Table 2. EDS results of oxide films
View tableTable 2. EDS results of oxide films
Element C O Al Si Atomic fraction /% 17.23 53.18 25.22 4.37
Table 3. Main components of two-component acrylic polyurethane paint
View tableTable 3. Main components of two-component acrylic polyurethane paint
Component Topcoat Primer First component Hydroxy acrylic resin Acrylic resin Second component Hexamethylene diisocyanate biuret Polyisocyanate
Table 4. EDS results of primer and topcoat
View tableTable 4. EDS results of primer and topcoat
Sample Atomic fraction /% C O Ti Si Mg Pt Topcoat 78.42 20.32 0.23 0.29 0.15 0.59 Primer 78.36 20.35 0.26 0.31 0.12 0.60
Table 5. Process parameters of single-pulse laser paint removal experiment for composite paint layer system
View tableTable 5. Process parameters of single-pulse laser paint removal experiment for composite paint layer system
Parameter Value Average power （P） /W 100 Pulse width （τ） /ns 200 Repetition frequency （f） /kHz 10 Spot diameter （D） /μm 50
Table 6. Process parameters of multi-pulse surface scanning laser paint removal experiment for composite paint layer system
View tableTable 6. Process parameters of multi-pulse surface scanning laser paint removal experiment for composite paint layer system
Parameter Value Average power （P） /W 100 Pulse width （τ） /ns 200 Repetition frequency （f） /kHz 10 Spot diameter （D） /μm 50 Scanning speed （ν） /（mm‧s-1） 1000, 900, 800, 700 Line spacing （γ） /μm 0
Table 7. Detection contents and characterization devices
View tableTable 7. Detection contents and characterization devices
Content Equipment Gasification point of paint layer Thermal gravimetric analyzer （TGA） Strength limit of paint layer Universal testing machine （UTM） Surface and cross-section appearances before and after paint removal Optical microscope（OM）
White light interferometer （WLI）
Microstructure of surface after paint removal Scanning electron microscope （SEM） Composition of surface after paint removal Energy dispersive spectroscope （EDS）
Table 8. Thermophysical property parameters of paint layer
View tableTable 8. Thermophysical property parameters of paint layer
Parameter Value Density （ρ） /（kg‧m-3） 1450 Specific heat （Cp） /［J‧（kg∙K）-1］ 2500 Thermal conductivity （k） /［W∙（m∙K）-1］ 0.3 Absorption coefficient （A） 0.8 Young modulus （E）/Pa 1×1010 Thermal expansion coefficient （α）/K-1 6×10-6 Poisson ratio （μ） 0.17
Table 9. Stress-strain experimental parameters
View tableTable 9. Stress-strain experimental parameters
Parameter Value Tensile and compressive speed /（mm‧min-1） 10 Experimental temperature /℃ 22
Table 10. EDS test results of different surface areas after paint removal at different scanning speeds
View tableTable 10. EDS test results of different surface areas after paint removal at different scanning speeds
Point Atomic fraction /% C O Mg Si Ti S Pt Al 26.75 43.51 12.94 8.81 7.04 ‒ 0.95 ‒ B1 54.60 36.88 2.29 2.07 1.98 ‒ 0.56 ‒ B2 28.92 42.71 0.70 1.05 1.00 4.06 0.78 20.36 C1 53.12 25.87 3.34 2.97 3.02 2.78 0.65 8.25 C2 41.42 33.28 0.79 0.70 1.01 4.51 1.12 17.17
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Tiangang Zhang, Yu Li, Junhao Zou, Zhiqiang Zhang, Yanan Liu. Simulation and Experimental Study on Laser Cleaning of Surface Paint Layer of Aluminum Alloy Skin for Civil Aircraft[J]. Chinese Journal of Lasers, 2024, 51(16): 1602209
Paper Information
Category: Laser Surface Machining
Received: Aug. 1, 2023
Accepted: Oct. 11, 2023
Published Online: Apr. 17, 2024
The Author Email: Zhiqiang Zhang (zqzhang@cauc.edu.com)
CSTR:32183.14.CJL231079
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