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Chinese Journal of Lasers, Volume. 48, Issue 6, 0602103(2021)

Effect of Laser at Different Time Scales on Cleaning Quality of Paint on Al Alloy Surfaces

Zhenglong Lei1、*, Haoran Sun1, Ze Tian1, Taiwen Qiu2, Cheng Cheng2, Shuangchao Fu2, and Kai Li3
Author Affiliations
  • 1State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
  • 2Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China
  • 3CRRC Changchun Railway Vehicals Co., Ltd., Changchun, Jilin 130062, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (11)
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    References (27)
    Cited By (8)
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    Figures & Tables(11)
    Fourier infrared absorption spectrum analysis for paint coatings

    Fig. 1. Fourier infrared absorption spectrum analysis for paint coatings

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    Surface morphology of substrate before painting

    Fig. 2. Surface morphology of substrate before painting

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    Surface residues after millisecond and nanosecond pulse laser cleaning. (a) Surface residues after millisecond laser cleaning for Pc=400 W; (b) stripped paint coating when nanosecond pulse laser power Pn = 150 W

    Fig. 3. Surface residues after millisecond and nanosecond pulse laser cleaning. (a) Surface residues after millisecond laser cleaning for Pc=400 W; (b) stripped paint coating when nanosecond pulse laser power Pn = 150 W

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    Macro morphologies of surface after millisecond and nanosecond pulsed laser cleaning. (a) Pc=400 W; (b) Pc=500 W; (c) Pc=600 W; (d) Pn=200 W; (e) Pn=250 W; (f) Pn=300 W

    Fig. 4. Macro morphologies of surface after millisecond and nanosecond pulsed laser cleaning. (a) Pc=400 W; (b) Pc=500 W; (c) Pc=600 W; (d) Pn=200 W; (e) Pn=250 W; (f) Pn=300 W

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    Composition analysis of sample surface residue after paint removal by millisecond pulsed laser. (a) Micro morphology of residue; (b) residue energy spectrum analysis; (c) diffraction peak of residue obtained by XRD

    Fig. 5. Composition analysis of sample surface residue after paint removal by millisecond pulsed laser. (a) Micro morphology of residue; (b) residue energy spectrum analysis; (c) diffraction peak of residue obtained by XRD

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    Laser coating removal process obtained by high-speed camera. (a) Millisecond pulse laser cleaning process, Pc=500 W; (b) nanosecond pulse laser cleaning process, Pn=200 W

    Fig. 6. Laser coating removal process obtained by high-speed camera. (a) Millisecond pulse laser cleaning process, Pc=500 W; (b) nanosecond pulse laser cleaning process, Pn=200 W

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    Micro-morphologies of surface after laser cleaning. (a) Pc=400 W; (b) Pc=500 W; (c) Pc= 600 W; (d) Pn=200 W; (e) Pn=250 W; (f) Pn= 300 W

    Fig. 7. Micro-morphologies of surface after laser cleaning. (a) Pc=400 W; (b) Pc=500 W; (c) Pc= 600 W; (d) Pn=200 W; (e) Pn=250 W; (f) Pn= 300 W

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    Calculation diagram of cleaning area

    Fig. 8. Calculation diagram of cleaning area

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    Schematic diagrams of laser cleaning paint coated on aluminum alloy surface by different laser. (a) Millisecond pulsed laser; (b) nanosecond pulsed laser

    Fig. 9. Schematic diagrams of laser cleaning paint coated on aluminum alloy surface by different laser. (a) Millisecond pulsed laser; (b) nanosecond pulsed laser

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    • Table 1. Chemical composition of 2024 Al alloy (mass fraction)%

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      Table 1. Chemical composition of 2024 Al alloy (mass fraction)%

      SiFeCuMnMgNiZnTiOthersAl
      0.500.503.80--4.900.30--0.901.20--1.800.100.300.150.10Balance

    • Table 2. Experimental parameters of millisecond pulsed CO2 laser and nanosecond pulsed laser for cleaning

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      Table 2. Experimental parameters of millisecond pulsed CO2 laser and nanosecond pulsed laser for cleaning

      Millisecond pulsed laserNanosecond pulsed laser
      Physical quantitySymbolValuePhysical quantitySymbolValue
      Laser powerPc400--600 WAverage laser powerPn150--300 W
      Pulse frequencyfc500 HzPulse frequencyfn5000 Hz
      Pulse widthtc6×105 nsPulse widthtn60 ns
      Scanning speedvc2 m·min-1Scanning speedvn180 m·min-1
      Line spacinghc1 mmLine spacinghn0.2 mm
      Spot diameterdc~3.5 mmSpot diameterdn0.96 mm
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    Zhenglong Lei, Haoran Sun, Ze Tian, Taiwen Qiu, Cheng Cheng, Shuangchao Fu, Kai Li. Effect of Laser at Different Time Scales on Cleaning Quality of Paint on Al Alloy Surfaces[J]. Chinese Journal of Lasers, 2021, 48(6): 0602103

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    Paper Information

    Category: Laser Material Processing

    Received: Jun. 24, 2020

    Accepted: Aug. 21, 2020

    Published Online: Mar. 8, 2021

    The Author Email: Lei Zhenglong (leizhenglong@hit.edu.cn)

    DOI:10.3788/CJL202148.0602103

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology