Preparation And Research Of Corrosion Resistant And Antiscaling Polymer-based Functional Coatings

In this paper,three functional hydrophobic coatings based on silicone epoxy resin are designed for antiscaling and anti-corrosion of metal surfaces.（1）Polydimethylsiloxane（PDMS）modified ZnO combined with perfluoroethylene propylene copolymer（FEP）designed an organosilicon epoxy resin-based（EP）superhydrophobic functional coating（EP/ZnO-PDMS/FEP）is used for anti-scaling and anti-corrosion of metal surfaces.The prepared superhydrophobic coating has a hydrophobic angle and a rolling angle of（153±1.35）°and（3±0.9）°,respectively.Meanwhile,it’s has good self-cleaning properties.The scale inhibition experiment showed that the EP/ZnO-PDMS/FEP superhydrophobic coating has excellent anti-scaling performance,and the scale deposition on the coating surface is reduced by 45.9%compared with the pure silicone epoxy coating.Anti-corrosion tests show that the EP/ZnO-PDMS/FEP superhydrophobic coating has good corrosion resistance.After 20 days of immersion,the|Z|_0.01Hz.01Hz value remains above 10⁷Ω/cm²,which was about 4 Order of magnitude times higher than the low-frequency impedance value（10³Ω/cm²）of the uncoated Al plate in the salt solution for 2 hours.（2）The amino silicon oil modifying celatom particles（Si-ASO）were combined with polydimethylsiloxane（PDMS）to design an organosilicon epoxy resin-based（EP）composite functional coating（EP/Si-ASO/PDMS）used for antiscaling and anti-corrosion on metal surface.The prepared coating’properties were characterized by scanning electron microscope（SEM）,electrochemical workstation and friction testing machine.The results showed that the EP/Si-ASO/PDMS composite coating exhibited unique antiscaling properties with the deposition of CaCO₃ on the coating surface decreased by 45%compared with the EP/Si coating.At the same time,the corrosion resistance test proved that the EP/Si-ASO/PDMS composite coating had excellent corrosion resistance with the high impedance modulus(above 10¹⁰Ω/cm²)after immersion in 3.5 wt%NaCl solution for 34 days.In addition,the friction test diaplayed that the EP/Si-ASO/PDMS composite coating had good rubbing resistance with the weight loss only 26.47%after 5,000 cycles of rotational friction（3）Carbon nanotubes（CNTs）were used as the carriers of diethylenetriaminepenta（methylphosphonic acid）（DTPMPA）,combination with flake zinc powders and PVDF powders to fabricated a novel organosilicon epoxy resin-based（EP）composite coating（EP/iDCNTs/Zn/PVDF）used for anti-scaling and anti-corrosion purpose.Scaling experiments demonstrated that EP/iDCNTs/Zn/PVDF composite coating exhibits unique scaling inhabition properties.Compared with the commercial silicone epoxy coating（EP）,the amount of CaCO₃ sedimentation on the EP/iDCNTs/Zn/PVDF coating surface decreased by 81.6%.The corrosion resistance test proved that the EP/iDCNTs/Zn/PVDF composite coating had outstanding corrosion resistance.Even after immersion in 3.5 wt%NaCl solution for 25 days,the|Z|_{0.01 Hz} of EP/iDCNTs/Zn/PVDF composite coating were about 2 orders of magnitude higher than that of the EP coating after immersion 7 days.