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Corrosion protection of active metals is an example where smart behavior of nanostructured coatings can be shown and their advantages in corrosion protection are obvious, compared to regular materials. Electrochemical methods allow precise study of this phenomenon. Reported study was focused on different aspects of diffusion-linked smart behavior i...
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The present study is aiming to study the effect of sulfuric acid diamide (SAD) on corrosion of bronze CuSn8. In order to determine the optimal corrosion inhibiting effect SAD was tested at different concentrations. The inhibiting effect of the SAD was investigated by electrochemical methods, in a 0.2 g/L Na2SO4 + 0.2 g/L NaHCO3 (pH = 5) solution si...
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We demonstrated the mechanism that makes Graphene Oxide (GO) a superior corrosion protection material over reduced graphene oxide (rGO) and nitrogen doped reduced graphene oxide (N-rGO). According to the results of our electrochemical study, supported by a host of characterization methods and density functional theory (DFT) based calculations, reduction of GO to synthesize rGO or doping of foreign heteroatoms like nitrogen to synthesize N-rGO, exposes and/or creates the defects/pores on the basal carbon plane of GO. Through these defects/pores of rGO and N-rGO, the corrodants react with the metal-surface and corrode it. A subnanometric layer of GO adhered to carbonyl iron (CI) surfaces through grafting by a thin Glycine (Gly) layer, repels the corrodants and shows robust corrosion protection performance in 1M KCl solution, over a similar layer of rGO or N-rGO. Hence, our work demonstrate that a coating of GO on metallic Fe surface, grafted via a thin glycine layer, is the economical solution and has the robust performance for their direct industrial application for corrosion protection.
The corrosion resistance behavior of graphene oxide (GO) sheets coated carbonyl iron
(CI) microspheres (GO/p-CI sample) was investigated and compared with that of bare CI
particles. The GO coating on the CI particles was achieved by utilizing 4-aminobenzoic acid as grafting agent. The cyclic voltammetry of the electrode containing this GO/p-CI sample in 1 mol/L KCl solution does not show any oxidation-peak in contrast to that of the bare carbonyl iron (CI) containing electrode. The charge transfer resistance of GO/p-CI sample was measured to be higher than that of bare CI. The corrosion-potential shifts towards the positive potential direction confirming higher passivity/less corrosive nature of the GO/p-CI sample. Furthermore, the corrosion-current of GO/p-CI sample was lower than that of the bare CI particles. Our results confirm the passivity and excellent corrosion protection behavior of the GO coating on iron structures.
