| LI Tian-ran,LU Chen-guang,YUAN Zi-chao,LIU Cong,LI Yun-dan,LIU Ya-hua.Mechanical Stability and Anti-icing Performance of Robust Aluminum-based Superhydrophobic Coating[J],51(11):385-394, 404 |
| Mechanical Stability and Anti-icing Performance of Robust Aluminum-based Superhydrophobic Coating |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.036 |
| KeyWord:superhydrophobic coating spraying mechanical stability anti-icing |
| Author | Institution |
| LI Tian-ran |
Dalian University of Technology, Liaoning Dalian , China |
| LU Chen-guang |
Dalian University of Technology, Liaoning Dalian , China |
| YUAN Zi-chao |
Dalian University of Technology, Liaoning Dalian , China |
| LIU Cong |
Dalian University of Technology, Liaoning Dalian , China |
| LI Yun-dan |
AVIC Shenyang Engine Design and Research Institute, Shenyang , China |
| LIU Ya-hua |
Dalian University of Technology, Liaoning Dalian , China ;Key Laboratory of Bionic Engineering Ministry of Education, Changchun , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Superhydrophobic surfaces hold great application prospects in the fields of self-cleaning, drag reduction, condensing heat transfer and anti-icing. However, conventional superhydrophobic surfaces have some disadvantages such as complex preparation process and poor durability. The work aims to construct a fluorine-free robust superhydrophobic coating (RSHC) with excellent mechanical stability and anti-icing performance by simple one-step spraying process with film forming resin and hydrophobic nanoparticles. Silicone resin (SI) and epoxy resin (EP) were used as film forming materials, and hydrophobic SiO2 composite nanoparticles were added to prepare superhydrophobic coatings by one-step spraying. The surface wettability was characterized by contact angle measuring instrument. The surface morphology and elemental composition were characterized by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). By adjusting the ratio of SI, EP and SiO2 nanoparticles, the effects of different ratio of material composition on the coating properties were explored. The mechanical stability was assessed by linear friction test, tape stripping test and jet impact test. The coating was placed on sandpaper (grit no. 1000) and reciprocally pushed for 10 cm under a weight of 100 g to complete the linear friction test. The process of tape stripping test was to peel off from one end to the other at a uniform speed with tape after the coating surface was cross scratched. In the jet impact test, a high pressure water jet (42 kPa) was used to impact the superhydrophobic coating surface vertically. Moreover, the icing resistance of the surface was verified by tests including static drop freezing, drop bouncing at a low temperature and freezing rain impact. The static freezing experiment was performed by comparing the freezing time of static droplets on surfaces with or without coatings. The dynamic freezing test included drop bounce at a low temperature and freezing rain impact. The drop freezing time and drop impact dynamics were visualized and compared on different surfaces. It was shown that the coated surface possessed the best hydrophobicity and mechanical stability when the mass ratio of SI, EP and SiO2 nanoparticles was 2.8∶1.2∶1. The coating exhibited an excellent superhydrophobicity with a contact angle of 158°4° and a sliding angle of 8°0.6°. The enhanced wear resistance of durable superhydrophobic coating made the water contact angle larger than 157° after 100 friction cycles; the adhesive tape stripping experiment verified that the coating held a solid adhesion between the substrate and the coating, and the surface still maintained a contact angle greater than 150° after 20 stripping cycles. When water jet impinged on the coated surfaces for 30 min, the surface contact angle kept almost constant, indicating that the coating possessed a high impact resistance. In addition, the coated substrate had excellent static and dynamic anti-icing performance. In the static drop freezing experiment, the time delay on the coated surface was about 7 times than that on the uncoated ones. In the dynamic freezing experiment, the water flow could bounce and roll off the surface to keep the surface ice-free at a low temperature. Similar phenomenon was observed in the freezing rain drop impact. The superhydrophobic coating fabricated with silicone resin and epoxy resin possesses good hydrophobicity, mechanical stability and anti-icing performance, which shows positive impact on the research and application of robust superhydrophobic coating. |
| Close |
|
|
|