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Chinese Journal of Lasers, Volume. 47, Issue 8, 802005(2020)

Ultrafast Laser Fabricated Drag Reduction Micro-nano Structures and Their Corrosion Resistance

Jiang Guochen, Pan Rui, Chen Changhao, Hu Xinyu, Zhang Hongjun, and Zhong Minlin*
Author Affiliations
  • Laser Materials Processing Research Center, School of Materials Science and Engineering,Tsinghua University, Beijing 100084, China
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    References (39)
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    Figures & Tables(9)
    Processing system and schematic diagram of groove structure fabrication by femtosecond laser. (a) Processing system figure; (b) diagram

    Fig. 1. Processing system and schematic diagram of groove structure fabrication by femtosecond laser. (a) Processing system figure; (b) diagram

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    Influences of laser parameters on micro-U-shaped groove depth and cross-section profiles and morphologies of various microgroove structures fabricated by the ultrafast laser. (a1) Influence of laser power on micro-U-shaped groove depth; (a2) influence of scanning speed on micro-U-shaped groove depth; (a3) repetition time on on micro-U-shaped groove depth; (b1)(b2)(c1)(c2) cross-section profiles and morphologies of two kinds of micro-U-shaped grooves; (d1)(d2) cross-section profile and morphology

    Fig. 2. Influences of laser parameters on micro-U-shaped groove depth and cross-section profiles and morphologies of various microgroove structures fabricated by the ultrafast laser. (a1) Influence of laser power on micro-U-shaped groove depth; (a2) influence of scanning speed on micro-U-shaped groove depth; (a3) repetition time on on micro-U-shaped groove depth; (b1)(b2)(c1)(c2) cross-section profiles and morphologies of two kinds of micro-U-shaped grooves; (d1)(d2) cross-section profile and morphology

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    Micro-morphology of two kinds of micro-U-shaped groove structures

    Fig. 3. Micro-morphology of two kinds of micro-U-shaped groove structures

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    Results of drag reduction test. (a) Test procedure; (b) motion time of “round boat”; (c) average motion time

    Fig. 4. Results of drag reduction test. (a) Test procedure; (b) motion time of “round boat”; (c) average motion time

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    Results of potentiodynamic polarization curve test

    Fig. 5. Results of potentiodynamic polarization curve test

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    Corrosion resistance test using morphology. (a) Morphology of three kinds of aluminum alloys after immersing in salt solution for different time: (a1)(a2)(a3) 0 h; (a4)(a5)(a6) 96 h; (a7)(a8)(a9) 192 h. (b) Micro morphology of three kinds of aluminum alloys after immersing in salt solution for 192 h: (b1) U1 structure; (b2) U2 structure; (b3) superhydrophobic U1 structure; (b4) superhydrophobic U2 structure. (c) Contact angle test: (c1) pristine alumin

    Fig. 6. Corrosion resistance test using morphology. (a) Morphology of three kinds of aluminum alloys after immersing in salt solution for different time: (a1)(a2)(a3) 0 h; (a4)(a5)(a6) 96 h; (a7)(a8)(a9) 192 h. (b) Micro morphology of three kinds of aluminum alloys after immersing in salt solution for 192 h: (b1) U1 structure; (b2) U2 structure; (b3) superhydrophobic U1 structure; (b4) superhydrophobic U2 structure. (c) Contact angle test: (c1) pristine alumin

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    • Table 1. Chemical composition of 6061 aluminum alloy

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      Table 1. Chemical composition of 6061 aluminum alloy

      ContentMgSiFeCuMnCrZnTi
      Minimum mass fraction /%-0.4-0.15-0.04--
      Maximum mass fraction /%1.20.70.70.400.150.350.250.15

    • Table 2. Main processing parameters of the ultrafast laser to produce drag reduction micro-U-shaped groove structure

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      Table 2. Main processing parameters of the ultrafast laser to produce drag reduction micro-U-shaped groove structure

      ParameterValue
      Power /W4.4 to 7.2
      Scanning speed /(mm·s-1)50 to 140
      Repetition times1 to 5

    • Table 3. Fitted corrosion resistance parameters from potentiodynamic polarization curve test

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      Table 3. Fitted corrosion resistance parameters from potentiodynamic polarization curve test

      SampleSelf-corrosionpotential E/VCorrosion currentdensity I /(A·cm-2)Corrosion speed /(10-3 mm·a-1)
      Pristine aluminum alloy-0.8691.470×10-71.55
      U1 structure-0.9343.728×10-74.06
      U2 structure-0.9162.467×10-72.69
      Superhydrophobic U1 structure-0.8364.994×10-80.53
      Superhydrophobic U2 structure-0.8336.942×10-80.73
      Fluorinated aluminum alloy-0.7692.317×10-80.25
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    Jiang Guochen, Pan Rui, Chen Changhao, Hu Xinyu, Zhang Hongjun, Zhong Minlin. Ultrafast Laser Fabricated Drag Reduction Micro-nano Structures and Their Corrosion Resistance[J]. Chinese Journal of Lasers, 2020, 47(8): 802005

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    Paper Information

    Category: laser manufacturing

    Received: Feb. 25, 2020

    Accepted: --

    Published Online: Aug. 24, 2020

    The Author Email: Minlin Zhong (zhml@tsinghua.edu.cn)

    DOI:10.3788/CJL202047.0802005

    Topics

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