Fabrication And Anti-corrosion/Scaling Properties Of Durability Superhydrophobic Composite Coating

Superhydrophobic materials are usually used for corrosion and scaling prevention of metals and alloys because of their outstanding hydrophobic properties.However,in the process of industrial production,the surface of the material is vulnerable to chemical erosion and physical impact,resulting in the destruction of the chemical composition and physical structure,so that the coating loses its anti-corrosion and scale resistance.In view of the above problems,this paper designs and syntheses three kinds of durable super hydrophobic/super oil-philic coatings with excellent mechanical properties and long-term anticorrosion and scaling resistance from the perspectives of microarchitecture,interface strengthening and wettability,chemical stability,weather resistance,corrosion resistance and scaling resistance of these three coatings.The main research content of this paper is as follows:（1）In view of the insufficient durability and anti-corrosion properties of the superhydrophobic coating,carboxylated carbon nanotubes（C-CNT_S）were used as the emulsifier to separate aluminum dihydrogen phosphate（ADP）and polyperfluoroethylene propylene（FEP）in the liquid phase.After spraying,the second phase separation occurred through heat treatment,and mastoid micro/nano structures with stable mechanical properties were formed on the surface of the coating.Thus,a durable organic-inorganic hybrid superhydrophobic coating was prepared.The water contact Angle（WCA）of the coating was162±1.1°,and the slip Angle（SA）was 5±0.5°.Good hydrophobic performance was maintained after 1000 times of cyclic friction under 250 k Pa pressure or 200 k Pa high pressure water impact.The WCA remained above 155°after 7 days of immersion in strong alkali,and above 160°after20 days of continuous exposure to intense ultraviolet light（300W/m²）.It shows that the coating has good superhydrophobicity,corrosion resistance and excellent mechanical durability.（2）To solve the problem of insufficient anticorrosion and scale inhibition performance of superhydrophobic coating in petroleum produced liquid,hydroxylated carbon nanotubes（H-CNT_S）and titanium dioxide whiskers（W-Ti O₂）were combined to form a unique nanoscale network structure,and fluorocarbon resin（FEVE）was combined to enhance the interfacial ability of the coating.Thus,a durable super hydrophobic/super oleophilic composite coating is prepared.The coating maintained good superhydrophobicity after 600 cycles of friction at 125k Pa pressure.Due to the synergic effect of non-perfluorinated compounds and network structure,the coating forms A stable oil film in oil-bearing brine,effectively resisting the corrosion ions,and the Icorr is as low as 3.16×10^-9 A/cm²,and E_corr is as high as 98 m V.The deposition of Ca CO₃was only 0.231 mg/cm² after the coating was immersed in an oily solution containing high concentration of Ca⁺for seven days.It shows that the coating has excellent anti-corrosion and anti-scale properties and mechanical durability.（3）In order to solve the problem of insufficient corrosion scaling performance of super hydrophobic and super oilphilic coatings caused by oil film loss in oil-water emulsion,graphene oxide and negative ion powder composite nanoparticles（GO@TP）were synthesized in situ by hydrothermal method,and combined with PAI/PTFE composite resin to prepare a durable super hydrophobic/super oilphilic sustained release coating.The coating maintained a good hydrophobic performance after 800 times of cyclic friction at 125 k Pa pressure or 200 k Pa of high pressure water impact.Due to the addition of negative ion powder（TP）particles,after the oil film is damaged,TP can ionize water molecules to form hydroxyl negative ions,and inhibit the crystallization of inorganic scale,so as to further improve the scale inhibition performance of the coating,the coating after seven days of immersion in the oil-water emulsion is only0.22mg/cm².At the low frequency high concentration of salt water for 30 days|Z|_0.01Hz is still as high as 10¹¹ ohm cm² above.It shows that the coating has excellent anti-corrosion properties and mechanical durability...