| The bionic superhydrophobic surface has broad application prospects because of the characteristics of self-cleaning,anti-icing,anti-fogging,anti-fouling and anti-corrosion.In this paper,?-FeOOH,SiO2 and KCC-1 submicron particles were prepared and used to make superhydrophobic surfaces with micro-nanostructure and low surface energy on the surface of magnesium alloy by spraying method.The coating and the air layer captured by the surface microstructure of the coating effectively isolate the corrosive medium from the substrate to achieve corrosion protection.At the same time,the stability of the coating,self-cleaning,anti-seaweed adhesion and other properties were studied.Hydrophobic ?-FeOOH submicron particles which were prepared by one-step hydrothermal synthesis were filled into polydimethylsiloxane(PDMS)to spray?-FeOOH/PDMS coating on the surface of magnesium alloy AZ31.When the mass ratio of?-FeOOH reached to 85%,the coating became superhydrophobic and the water contact angle of the coating was 152.6°.The stability of the coating was verified by friction and wear experiment,different temperature treatment and acid-base salt solution immersion experiment.Electrochemical test shows that the coating can protect the substrate from corrosion within 15 days;in addition,the coating exhibits excellent self-cleaning,anti-sludge and seaweed adhesion resistanceThe silica submicron particles were synthesized by a simple Stober method and hydrophobized by hexamethyldisilazane.The silica in an amount of 30%was added into the ODA/PVDF solution with octadecyl amine concentration of 2%and dried in an oven at 40?to obtain a stable superhydrophobic surface with a water contact angle of 156°.The friction and wear test and the acid-base salt solution immersion results showed that the coating had good stability.After the sandpaper worn,the water contact of coating was reduced to 108°.However,the coating was restored to superhydrophobicity by 40? heat-treatmentd.The superhydrophobic coating could be prepared on plastic,glass,cotton cloth and A4 paper,which proved that the method was not limited by the substrate and could be widely used.At the same time,the coating also had excellent corrosion resistance,self-cleaning,anti-sludge suspension and seaweed adhesion resistance properties.KCC-1 microspheres were synthesized by calcination using cetylpyridinium bromide as a template and then dispersed in polyvinylidene fluoride PVDF solution to prepare KCC-1/PVDF coating.After modified by Hexadecyltrimethoxysilane,the coating became superhydrophobic and the water contact angle was 155°and a slippery liquid-infused porous surface(SLIPS)with a slide angle of 4.5°was obtained by injecting the lubricating oil.In the friction and wear test,the wear resistance of the SLIPS was better than that of the superhydrophobic surface,which was better than the bare magnesium alloy.The anti-icing experiment results showed that the SLIPS can effectively delay the freezing of droplets on the surface.In addition,the SLIPS could resist the adhesion of other liquids such as coffee and sludge and seaweed;the coatings could effectively protect the magnesium alloy for a long time and the SLIPS had better corrosion resistance than the superhydrophobic coating.The corrosion inhibition efficiency of SLIPS and superhydrophobic coating respectively were 100%and 98.28%. |
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