Chinese Journal of Lasers, Volume. 49, Issue 16, 1602020(2022)
Effect of Laser Cleaning Process Parameters on Surface Quality of 7075 Aluminum Alloy Anodic Oxidation Film
Figures & Tables(25)
Fig. 2. Original morphologies of 7075 aluminum alloy after anodic oxidation. (a) Original morphology under optical microscope; (b) original microscopic morphology and elemental content
Fig. 5. Morphologies of sample surfaces after cleaning under different average powers by optical microscope. (a) 175 W; (b) 200 W; (c) 225 W; (d) 250 W
Fig. 6. Microscopic morphologies of sample surfaces after cleaning under different average powers by SEM. (a) 175 W；(b) 200 W; (c) 225 W; (d) 250 W
Fig. 7. Morphologies of sample surfaces after cleaning under different scanning speeds by optical microscope. (a) 1500 mm/s; (b) 2000 mm/s; (c) 2500 mm/s; (d) 3000 mm/s
Fig. 8. Microscopic morphologies of sample surfaces after cleaning under different scanning speeds by SEM. (a) 1500 mm/s; (b) 2000 mm/s; (c) 2500 mm/s; (d) 3000 mm/s
Fig. 9. Morphologies of sample surfaces after cleaning under different pulse frequencies by optical microscope. (a) 2.5 kHz; (b) 3.0 kHz; (c) 3.5 kHz; (d) 4.0 kHz
Fig. 10. Microscopic morphologies of sample surfaces after cleaning under different pulse frequencies by SEM. (a) 2.5 kHz；(b) 3.0 kHz; (c) 3.5 kHz; (d) 4.0 kHz
Fig. 11. Principle diagrams of laser cleaning of anodic oxidation film. (a) Schematic of laser energy diffusion inside sample; (b) schematic of oxide film removal mechanism on sample surface
Fig. 12. Morphology and elemental content of surface after laser cleaning anodic oxidation film when P＝250 W, f＝3.5 kHz, and v＝2500 mm/s
Fig. 16. Three-dimensional morphologies of sample surfaces after cleaning under different average powers. (a) 200 W; (b) 225 W; (c) 250 W
Fig. 17. Three-dimensional morphologies of sample surfaces after cleaning under different scanning speeds. (a) 2000 mm/s; (b) 2500 mm/s; (c) 3000 mm/s
Fig. 18. Three-dimensional morphologies of sample surfaces after cleaning under different pulse frequencies. (a) 2.5 kHz; (b) 3.0 kHz; (c) 3.5 kHz
Fig. 19. Three-dimensional morphologies of sample surfaces. (a) Three-dimensional morphology of original sample surface before cleaning; (b) three-dimensional morphology of sample surface after cleaning when P＝225 W, v＝2500 mm/s, and f＝2.5 kHz
Table 1. Elemental contents of aluminum alloy surfaces after cleaning under different average powers
View tableTable 1. Elemental contents of aluminum alloy surfaces after cleaning under different average powers
Element Average power of 175 W Average power of 200 W Average power of 225 W Average power of 250 W Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% C 16.47 29.38 9.47 19.02 4.72 10.33 4.55 10.04 O 12.90 17.26 5.33 8.04 0.75 1.23 0.24 0.40 Mg 1.02 0.90 1.58 1.57 1.91 2.07 1.91 2.08 Al 62.50 49.61 76.57 68.43 85.62 83.45 86.09 84.49 S 1.49 1.00 0.84 0.63 0.20 0.17 0.13 0.10 Cu 0.97 0.33 1.69 0.64 1.84 0.76 2.01 0.84 Zn 4.65 1.52 4.50 1.66 4.96 1.99 5.07 2.05
Table 2. Elemental contents of aluminum alloy surfaces after cleaning under different scanning speeds
View tableTable 2. Elemental contents of aluminum alloy surfaces after cleaning under different scanning speeds
Element Scanning speed of 1500 mm/s Scanning speed of 2000 mm/s Scanning speed of 2500 mm/s Scanning speed of 3000 mm/s Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% C 14.04 26.79 11.68 23.20 3.79 8.47 9.26 18.65 O 5.99 8.58 3.43 5.11 0.26 0.44 5.40 8.16 Mg 1.56 1.47 1.66 1.63 1.97 2.18 2.57 2.56 Al 70.72 60.07 75.90 67.14 85.93 85.51 75.35 67.54 S 1.05 0.75 0.59 0.44 0.19 0.16 0.87 0.66 Cu 1.54 0.55 1.44 0.54 1.80 0.76 1.46 0.56 Zn 5.11 1.79 5.31 1.94 6.07 2.49 5.09 1.88
Table 3. Elemental contents of aluminum alloy surfaces after cleaning under different pulse frequencies
View tableTable 3. Elemental contents of aluminum alloy surfaces after cleaning under different pulse frequencies
Element Pulse frequency of 2.5 kHz Pulse frequency of 3.0 kHz Pulse frequency of 3.5 kHz Pulse frequency of 4.0 kHz Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% Mass fraction /% Atomic fraction /% C 2.43 5.52 2.36 5.31 13.15 24.87 16.46 29.60 O 0.35 0.66 2.02 3.41 9.03 12.82 11.46 15.47 Mg 1.94 2.17 1.84 2.05 2.15 2.01 1.78 1.58 Al 87.18 88.18 85.41 85.57 67.65 56.97 62.7 50.18 S 0.14 0.12 0.42 0.36 1.45 1.03 1.90 1.28 Cu 1.85 0.80 1.76 0.75 1.68 0.60 1.22 0.41 Zn 6.11 2.55 6.19 2.56 4.89 1.70 4.47 1.48
Table 4. Surface roughnesses of sample after cleaning under different average powers
View tableTable 4. Surface roughnesses of sample after cleaning under different average powers
Average power /W 200 225 250 Surface roughness /μm 0.524 0.495 0.450
Table 5. Surface roughnesses of sample after cleaning under different scanning speeds
View tableTable 5. Surface roughnesses of sample after cleaning under different scanning speeds
Scanning speed /(mm·s－1) 2000 2500 3000 Surface roughness /μm 0.769 0.600 0.749
Table 6. Surface roughnesses of sample after cleaning under different pulse frequencies
View tableTable 6. Surface roughnesses of sample after cleaning under different pulse frequencies
Pulse frequency /kHz 2.5 3.0 3.5 Surface roughness /μm 0.526 0.672 0.552
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Wei Wang, Xiangjin Li, Weijun Liu, Fei Xing, Hongyou Bian. Effect of Laser Cleaning Process Parameters on Surface Quality of 7075 Aluminum Alloy Anodic Oxidation Film[J]. Chinese Journal of Lasers, 2022, 49(16): 1602020
Paper Information
Category: laser manufacturing
Received: Nov. 23, 2021
Accepted: Jan. 20, 2022
Published Online: Jul. 28, 2022
The Author Email: Liu Weijun (wjliu@sut.edu.cn)
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