Fabrication And Performance Study Of The Polysulfone-based Composite Superhydrophobic Coatings With Wear And Corrosion Resistance

In recent years,inspired by the lotus effect,superhydrophobic surfaces have attracted extensive attention in academic areas due to their unique properties.By investigating the superhydrophobic surfaces of animals and plants in nature,researcher found that the surface wettability can be regulated and controlled by changing its chemical composition and surface morphology.Based on this theory,we have successfully fabricated polysulfone-based composite superhydrophobic coatings with wear and corrosion resistance properties on the aluminum plate through a simple spray method.1.According to the polymer reinforcement theory,PSU,as the main material,is uesd to prepare superhydrophobic surface.The excellent ductility of PVDF can be used to overcome the intrinsic brittleness of PSU.Through adding the MMT modified by PDMS as filling materials,the PSU/PVDF/MMT-PDMS superhydrophobic composite coatingwith a high water contact angle(WCA)of 159° and a low slide angle(SA)of only 3.5° has been fabricated through a simple spraying method.The friction test results indicate that the wear life of the prepared coating is approximately 14.3 times longer than that of commercial fluorocarbon coating.Moreover,Tafel plots obtained by electrochemical measurements demonstrate that to estimate the the prepared coating possesses outstanding anti-corrosion property.2.Dopamine(DA)with the unique features,which can easily adhere to all solid surfaces and provide a secondary reaction platform,was selected to modify the PES powders.Then,nano-SiO2 particles were grown in-situ on the surfaces of the modified PES-DA powders by using sol-gel method.At the end of sol-gel process,POTS was used to modify the obtained PES-DA-SiO2 to improve the surface hydrophobicity.The superhydrophobic PES-DA-SiO2-POTS coating with biomimic “Litchi” structure was successfully prepared by spraying method on different substrate surfaces.The WCA of the prepared coating can achieve up to 157±1.5° and the SA is only 3±0.5°.Moreover,compared with the superhydrophobic PES/SiO2/POTS coating fabricated by physical mixing,the superhydrophobic PES-DA-SiO2-POTS coating possesses better wear resistance.3.The MMT-Si O2 with lamella and spherical structure were formed by in-situ growth of SiO2 on MMT surfaces via sol-gel.Selecting PES as main materials and modifying the prepared particles by amino silicon oil(APDMS),the fluorine-free superhydrophoic PES/APDMS/MMT-SiO2 coating with WCA 156.1±1.1° and SA 4.8±0.7° can be prepared byspraying method.The friction test results indicate that the anti-wear of the PES/APDMS/MMT-SiO2 superhydrophobic coating is over three times better than that of the PES/MMT/Si O2 coating prepared by simple physical mixture.The wettability of the rubbed coating can be recovered to superhydrophobicity by a simple roughness process.Moreover,the tested results of potentiodynamic polarization curves and electrochemical impedance spectroscopy exhibited the high protection efficiency(99.999%)of PES/APDMS/MMT-SiO2 composite coating even after 30 d immersion in 3.5 wt.% NaCl.