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Forming method of bionic porous structure with hydrophobic resistance reducing capability

A porous structure and forming method technology, applied in the field of metal surface treatment, can solve the problems of poor stability of the micro-nano bionic embossed structure, easy damage or even disappear of the embossed structure, difficulty in maintaining super-hydrophobic performance, etc., and achieve good lodging resistance , Excellent hydrophobic effect, good structural stability

Pending Publication Date: 2021-12-28
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of practical application, due to the relatively high speed between the aircraft and the water flow, when the surface embossed microstructure is impacted and rubbed by the water flow, the embossed structure is easily damaged or even disappears, and it is difficult to maintain superhydrophobic properties.
Since the artificially prepared superhydrophobic surface is not self-healing through metabolism like the surface of organisms, the micro-nano bionic embossed structure has poor stability, weak resistance to seawater erosion, and poor self-healing ability, which limits the bionic surface micro-nano structure. Application of Drag Reduction in Underwater Vehicles

Method used

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  • Forming method of bionic porous structure with hydrophobic resistance reducing capability
  • Forming method of bionic porous structure with hydrophobic resistance reducing capability
  • Forming method of bionic porous structure with hydrophobic resistance reducing capability

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Add the solute ethylene glycol sulfate and ammonium fluoride into the solvent deionized water to fully dissolve and stir evenly to obtain an anodic oxidation solution, in which the concentration of the solute is 30-50mL / L of ethylene glycol sulfate and 13g / L of ammonium fluoride ;

[0037] (2) The surface of the TC4 titanium alloy sample is degreased with a degreasing agent and then cleaned with deionized water. It is connected to the positive electrode of the anodized power supply, and the stainless steel plate is used as the cathode plate to connect to the negative electrode of the power supply. In the anodizing solution, turn on the anodizing power supply, gradually increase the oxidation voltage to 40V, and the oxidation time is 1h. During the oxidation process, the temperature of the solution is controlled at about 20°C by the chiller. After oxidation, turn off the oxidation power, rinse the sample with deionized water, and dry it with clean compressed air.

...

Embodiment 2

[0043] (1) Pre-polishing the surface of 5083 aluminum alloy to obtain the test sample after surface polishing. Put the polished 5083 aluminum alloy sample into deionized water for ultrasonic cleaning for 5 minutes, and then blow dry to obtain a 5083 aluminum alloy sample with a clean surface;

[0044] (2) The femtosecond ultrafast laser is used to complete the periodic hole preparation of 5083 aluminum alloy. The laser processing parameters are as follows: the laser wavelength is 1030nm, the laser power is 13W, the laser pulse frequency is 30kHz, the beam scanning speed is 200mm / s, the scanning path is linear scanning, and the scanning distance is 60μm.

[0045] (3) Inject low free energy substances such as silane or halothane coupling agent into the surface groove of the sample to obtain a surface biomimetic groove structure with superhydrophobic drag reduction capability.

[0046] (4) The surface wetting angle of 5083 aluminum alloy with smooth surface is 52.62°, and the ma...

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Abstract

The invention provides a forming method of a bionic porous structure with hydrophobic resistance reducing capability. According to the forming method, the porous structure is prepared on a metal surface by utilizing an ultrafast laser technology, a micro-arc oxidation technology or an anodic oxidation technology; the surface opening width of the porous structure is less than or equal to 2 mm; and the depth-to-width ratio is greater than or equal to 1:1. The bionic porous structure not only has the super-hydrophobic resistance reducing capacity but also is stable, durable and high in scouring resistance.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a method for forming a bionic porous structure with hydrophobic and drag-reducing capabilities. Background technique [0002] During the navigation of ships, manned deep submersibles, underwater weapons and other underwater vehicles, due to the boundary layer effect, seawater has a certain adhesion to the surface of the vehicle, resulting in greater navigation resistance. According to statistical analysis, underwater vehicles are mainly affected by wave resistance, pressure difference resistance and friction resistance during navigation. Existing research results show that wave-making resistance accounts for 10%-20% of navigation resistance, pressure difference resistance accounts for 20-25%, and friction resistance accounts for 45-50%. It can be seen that the navigation resistance encountered by the underwater vehicle during navigation is mainly frictional resistance. In...

Claims

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Application Information

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IPC IPC(8): C25D11/02C25D11/06C25D11/12C25D11/16C25D11/26B23K26/352
CPCC25D11/026C25D11/02C25D11/16C25D11/26C25D11/12C25D11/06B23K26/355
Inventor 李治薛钢吴艳明王杏华
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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