A novel antiscaling and anti-corrosive polymer-based functional coating

Carbon nanotubes (CNTs), as a carrier of diethylenetriaminepenta(methylphosphonic acid) (DTPMPA), combining with flake zinc and PVDF powders, were used to fabricate a novel organosilicon epoxy resin-based (EP) composite coating (EP/iDCNTs/Zn/PVDF) for antiscaling and anti-corrosion purposes. Compared with EP coating, the EP/iDCNTs/Zn/PVDF composite coating exhibited unique antiscaling properties with the CaCO 3 deposition on the coating surface decreased by 81.6%. It was mainly because the coating surface contains DTPMPA, and Zn 2+ released by corrosion of Zn powder, which jointly inhibited the deposition behavior of CaCO 3 . Meanwhile, the fabricated composite coating hardly adhered by CaCO 3 crystals which was due to its higher hydrophobicity. Moreover, anti-corrosion tests proved that the prepared composite coating's impedance modulus was about 2 orders higher than that of the EP coating. This was ascribed to the improving shielding effect of fillers and high hydrophobicity of coating, preventing the water and oxygen molecules from penetrating into the composite coating.