Zinc oxides for nanopigmented coatings for electroactive anti-corrosion protection of C-steel structures
Date
2023-10-27
Authors
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Journal ISSN
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Publisher
Sausi Digital Library
Abstract
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.
Description
The thesis focuses on the ZnO fabrication, using various synthetic methods, to employ in
anticorrosive coatings for steel products. The results related to ZnO morphology are interesting
and novel. A thorough characterisation of the materials
was carried out using a standard set of the techniques SEM, FTIR, XRD, Raman.
There are several aspects of the originality in this work, which are as follows;
1. The formation of the perforated morphology of ZnO with 2D sheets morphology; the
mechanisms can be further explored to get a better understanding of the mechanism and the
effects of; sequencing, additives, temperature and pH, based on the three methods discussed.
2. electrochemistry aspects of the epoxy resin and ZnO to protect steel; and the morphology can
influence anticorrosion properties.
Keywords
zinc oxide synthesis, zinc oxide morphology, zinc oxide coating, anticorrosion protection