Research on Paint Removal Technology for Aluminum Alloy Using Pulsed Laser

Haichao Zhao; Yulin Qiao; Xian Du; Sijie Wang; Qing Zhang; Yan Zang

doi:10.3788/CJL202148.0302001

Chinese Journal of Lasers, Volume. 48, Issue 3, 0302001(2021)

Research on Paint Removal Technology for Aluminum Alloy Using Pulsed Laser

Haichao Zhao¹, Yulin Qiao^1、*, Xian Du¹, Sijie Wang¹, Qing Zhang², and Yan Zang²

¹National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China

²Key Laboratory on Remanufacturing,Army Academy of Armored Forces, Beijing 100072, China

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Figures & Tables(18)

Fig. 1. Schematics of laser cleaning device and cleaning method. (a) Schematic of laser cleaning device; (b) cleaning method of paint removal

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Fig. 2. Three-dimensional finite element model for laser cleaning

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Fig. 3. Three-dimensional morphologies of the surface cleaned at different scanning speeds. (a) 200mm/s; (b) 400mm/s; (c) 600mm/s; (d) 800mm/s; (e) 1000mm/s; (f) 1200mm/s

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Fig. 4. Three-dimensional morphologies of the surface cleaned at different pulse frequencies. (a) 20kHz; (b) 25kHz; (c) 30kHz; (d) 35kHz; (e) 40kHz; (f) 45kHz

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Fig. 5. Three-dimensional morphologies of the surface cleaned at different powers. (a) 10.5W; (b) 13.5W; (c) 16.5W;(d) 19.5W; (e) 22.5W; (f) 25.5W

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Fig. 6. Morphologies of the surface cleaned at different parameters. (a) SEM morphology, v=200mm/s; (b) SEM morphology, f=25kHz; (c) SEM morphology, v=1000mm/s; (d) three-dimensional morphology, v=1000mm/s; (e)(f) SEM morphology, f=40kHz

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Fig. 7. XPS C 1s and O 1s spectra of the paint surface. (a)(b) Original surface; (c)(d) surface after cleaning with the frequency of 40kHz

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Fig. 8. Cross-section SEM images of residual paint(f=40kHz). (a) 2000×; (b) 10000×; (c) 50000×; (d) 20000×

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$SEM images of collected particles during cleaning process. (a) Interlaminar crack; (b) no fracture trace in the layer; (c) spherical particles and network structure; (d) nanoparticles distribution$

Fig. 9. SEM images of collected particles during cleaning process. (a) Interlaminar crack; (b) no fracture trace in the layer; (c) spherical particles and network structure; (d) nanoparticles distribution

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Fig. 10. Temperature at different positions in the x-axis direction at t=0.000268s

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Fig. 11. Thermal stress at different positions in the x-axis direction at t=0.000268s

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Fig. 12. Mechanism of paint removal with pulsed laser

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Table 1. Main parameters of optical fiber laser
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Table 1. Main parameters of optical fiber laser
Wavelength/nm Maximum power/W Pulse width/μs Pulse frequency/kHz Trigger mode
1064 30 1 20--100 Pulsed

Table 2. Spot overlap rate and surface roughness of the surface cleaned at different scanning speeds
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Table 2. Spot overlap rate and surface roughness of the surface cleaned at different scanning speeds
Scanning speeds/(mm·s^-1) U_p/% Surface roughness /μm
200 91.50 4.602
400 82.90 1.575
600 74.40 1.205
800 65.80 2.530
1000 57.30 3.456
1200 48.72 4.204

Table 3. Surface roughness of the surface cleaned at different pulse frequencies
View table
Table 3. Surface roughness of the surface cleaned at different pulse frequencies
Pulse frequency /kHz U_p/% Surface roughness /μm Pulse frequency /kHz U_p/% Surface roughness /μm
20 61.54 2.270 35 78.02 1.053
25 69.23 2.059 40 80.77 2.396
30 74.40 1.205 45 82.91 2.712

Table 4. Surface roughness of the surface cleaned at different laser powers
View table
Table 4. Surface roughness of the surface cleaned at different laser powers
Power /W Surface roughness /μm
10.5 3.422
13.5 2.976
16.5 1.205
19.5 1.615
22.5 1.890
25.5 2.289

Table 5. EDS results of different areas in Fig. 6
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Table 5. EDS results of different areas in Fig. 6
Region Atomic fraction/%
C O Al Ti Si
Original paint 68.17 30.93 0.12 0.46 0.31
Region 1 36.09 49.70 6.79 4.23 3.19
Region 2 56.63 36.81 3.81 1.99 0.76
Region 3 61.19 34.85 0.27 2.73 0.96
Region 4 58.77 37.59 1.30 1.72 0.62

Table 6. Results of the peak separation of XPS C 1s, O 1s spectra, together with the binding energy

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Table 6. Results of the peak separation of XPS C 1s, O 1s spectra, together with the binding energy

Element	Original surface		Cleaned surface
Element	Bondingenergy/eV	Assignment	Bondingenergy/eV	Assignment
C 1s	283.97	C—HC—C	284.32	C
	284.44	—CH₂—C—C	284.70	C(—CH₂CHC(CH₃)CH₂—)_n
	284.83	(—CH₂C(CH₃)(C(O)OH)—)_n(—CH₂C(CH₃)(C(O)OCH₃)—)_n	285.03	(—CH₂CH(C(O)OH)—)_n(—CH₂CH₂—)_n(—CH₂C(CH₃)₂—)_n(—CH₂C(CH₃)(C(O)OH)—)_n
	288.37	(—CH₂C(CH₃)(C(O)OCH₃)—)_nO=C—NC—N	285.71	(—CH₂C(CH₃)(C(O)OCH₃)—)_n(—CH₂C(CH₃)(C(O)OC(CH₃)₃)—)_n
O 1s	529.27	TiO_x	288.56	(—CH₂CH(C(O)OCH₃)—)_n(—CH₂C(CH₃)(C(O)OCH₃)—)_n
	529.80	TiO₂,MgO	530.02	TiO₂
	530.38	SiO₂,TiO₂	530.54	Al₂O₃,Al₂TiO₅
	530.87	Al₂O₃,TiO₂,TiO,MgO	531.11	Al(OH)₃,Al₂O₃,Ti₂O₃
	531.92	(—CH₂C(CH₃)(C(O)OCH₃)—)_n	531.65	(—CH₂C(CH₃)(C(O)OCH₃)—)_n
	534.25	—C=O—COOC—	532.26	SiO₂,Al₂O₃
	535.41	—C=O	532.94	(—CH₂CH(C(O)OH)—)_n

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Haichao Zhao, Yulin Qiao, Xian Du, Sijie Wang, Qing Zhang, Yan Zang. Research on Paint Removal Technology for Aluminum Alloy Using Pulsed Laser[J]. Chinese Journal of Lasers, 2021, 48(3): 0302001

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Paper Information

Category: laser manufacturing

Received: Mar. 18, 2020

Accepted: Jun. 9, 2020

Published Online: Feb. 23, 2021

The Author Email: Qiao Yulin (zhchebei@sina.com)

DOI:10.3788/CJL202148.0302001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Main parameters of optical fiber laser

Table 1. Main parameters of optical fiber laser

Table 2. Spot overlap rate and surface roughness of the surface cleaned at different scanning speeds

Table 2. Spot overlap rate and surface roughness of the surface cleaned at different scanning speeds

Table 3. Surface roughness of the surface cleaned at different pulse frequencies

Table 3. Surface roughness of the surface cleaned at different pulse frequencies

Table 4. Surface roughness of the surface cleaned at different laser powers

Table 4. Surface roughness of the surface cleaned at different laser powers

Table 5. EDS results of different areas in Fig. 6

Table 5. EDS results of different areas in Fig. 6

Table 6. Results of the peak separation of XPS C 1s, O 1s spectra, together with the binding energy

Table 6. Results of the peak separation of XPS C 1s, O 1s spectra, together with the binding energy