Zinc oxides for nanopigmented coatings for electroactive anti-corrosion protection of C-steel structures

Zinc oxide particles (ZnO) were studied by investigating factors such as the effects of synthesis by precipitation, reflux and hydrothermal methods, the use of sodium hydroxide (NaOH) concentrations as participant agents with zinc acetate dihydrate, and the use of zinc resources such as zinc acetate dihydrate and zinc nitrate hexahydrate (Zn (NO3)2·6H2O). The effect of addition time on zinc oxide morphology using zinc nitrate hexahydrate and ammonium carbonate ((NH4)2CO3) was also studied. The current study highlights the effects of different addition types (DATs) using zinc acetate dihydrate and zinc nitrate hexahydrate as zinc sources and sodium hydroxide and ammonium carbonate as precipitation agents through precipitation and reflux methods. The effects of adding sodium dodecyl sulphate (SDS) were investigated, and it was found that adding SDS as a surfactant to zinc acetate dihydrate and sodium hydroxide resulted in a highly regular particle arrangement.
All zinc oxide particles were calcinated at 550°C for 4 hours and investigated using scanning electron microscopy (SEM), x-ray diffraction (XRD), Fourier transform infrared (FTIR) and Raman spectroscopy.
The results showed different zinc oxide morphologies, such as a flower shape consisting of rod or platelet morphologies, in the synthesis of zinc acetate and NaOH in the reflux method. The flower shape consisting of porosity sheet shapes was obtained using zinc nitrate hexahydrate and ammonium carbonate in the reflux method. These porosity sheet shapes seem to be new shapes that can be created without adding any chemical compounds or organic substances as surfactants. The rod and porosity shapes of steel coated with epoxy resin were applied to study the effect of corrosion resistance. Corrosion resistance was more efficient in zinc oxide with porosity-shaped morphology than in zinc oxide with rod-shaped morphology.