| XIA Tian,HE Xiu-quan,ZHANG Qiao-xin,YU Jin-gui,CHE Yong,LIU Rong.Simple and Rapid Fabrication and Properties of Superhydrophobic Coatings on the Surface[J],51(10):328-335 |
| Simple and Rapid Fabrication and Properties of Superhydrophobic Coatings on the Surface |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.10.035 |
| KeyWord:simple preparation super-hydrophobic fluorosilicone resin SiO2 sandblasting electrochemical corrosion |
| Author | Institution |
| XIA Tian |
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan , China |
| HE Xiu-quan |
Institute of Laser and Intelligent Manufacturing, South-Central University for Nationalities, Wuhan , China |
| ZHANG Qiao-xin |
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan , China |
| YU Jin-gui |
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan , China |
| CHE Yong |
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan , China |
| LIU Rong |
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan , China |
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| Abstract: |
| The current state of the superhydrophobic surfaces fabrication has the disadvantage of high cost and complicated process. We manufacture a superhydrophobic surface by SiO2 particles and fluorosilicone resinto. They are mixed to prepare the coating and sprayed on the surface of 5050 aluminum alloy, and cured at 250 ℃ to obtain the superhydrophobic surface. Sandblasting can impact the surface of the sample to create microstructure which can improve the superhydrophobicity of the surface while enhancing the surface performance and set up a variety of tests to study the impact of the sandblasted surface. This process is low cost and simple. 5050 aluminum alloy as base materials and smooth them by sandpaper, half of the surface base was covered, then the surface was sandblasted under 0.5 MPa pressure, the sandblasting time was 10 s, to obtain a base with half of the sandblasted surface and half of the polished surface. The substrate was cleaned, dried and then sprayed. The step test was carried out by controlling the number of spraying times from 5 to 30. Dry the sprayed sample at 80 ℃ and put it into the muffle furnace cure at 250 ℃. Through wettability test, electrochemical corrosion test, abrasion resistance test, long term immersion resistance test and self-cleaning test, we evaluated the wettability, seawater corrosion resistance, abrasion resistance, and long term immersion resistance of the sample surface. The surface topography and elementary composition were analyzed by SEM and EDS. After controlling the number of sprays, the surface had super-hydrophobic properties. The contact angle of droplets on the sandblasted surface under 30 spraying times was (153.9±1)°, and the rolling angle was (2.99±0.5)°. The electrochemical corrosion test showed that spraying fluorosilicone resin/SiO2 coating can improved the corrosion resistance of the 5050 surface. It was found in SEM that SiO2 particles can form lotus-like sub-micron protrusions on the surface of the substrate. The lowest corrosion current was 0.22 μA/cm2, and the highest corrosion voltage was 0.449 V. The contact angle of the sandblasted surface was (102.4±1)°, and the contact angle of the polished surface was (97±1)° after 25 times of rubbing. The contact angle of the sandblasted surface was (113.7±1)°, and the contact angle of the polished surface was (69.4±1)° after 10 days of soaking in NaCl solution. In the self-cleaning test, the sandblasted coating surface of the sample sprayed 20 times showed superior self-cleaning performance compared to the smooth coating surface. When the number of spraying reaches 15 times, the surface of the sandblasted coating has superhydrophobic properties. When it reaches 25 times, the surface of the polishing coating has superhydrophobic properties, and the sandblasted surface has a lower rolling angle. The corrosion resistance of the coated surfaces in NaCl solution enhance with the number of spray applied, it is found that the surface of the sandblasted coating is relatively it has better corrosion resistance on the polished coating surface. Under the same spray conditions, sandblasting the substrate can improve the corrosion resistance, wear resistance and durability of the superhydrophobic surface. |
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