Síntese de óxido de grafeno reduzido para produção de revestimentos nanocompósitos anticorrosivos a base de epóxi para aplicação na indústria petrolífera
Corrosion is a natural phenomenon that affects several industries that make use of metallic materials in their industrial plants, including the oil industry. In this segment, corrosion phenomena occur frequently in metallic piping, resulting in the loss of structural properties and reduction of i...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/50757 |
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| Resumo: | Corrosion is a natural phenomenon that affects several industries that make use
of metallic materials in their industrial plants, including the oil industry. In this segment,
corrosion phenomena occur frequently in metallic piping, resulting in the loss of
structural properties and reduction of its lifetime. This work aims to evaluate the
influence of rGO content on the behavior of an epoxy anticorrosion coating for
application in the oil industry. The coatings were applied to metal pipe substrates used
in the oil industry, aiming to increase corrosion and wear resistance. For this, graphene
oxide (GO) was first obtained from the chemical exfoliation of graphite based on the
improved Hummers method, and then a thermal reduction step was performed to
obtain rGO. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR),
Raman spectroscopy and scanning electron microscopy (SEM) analyses were
performed, aiming to prove the success in the synthesis of these nanomaterials. The
characteristic peaks of rGO for the respective analyses were consistent with the
literature, and its morphology showed a 3D structure with well exfoliated layers
characteristic of this material when thermally reduced. The nanocomposite coating was
synthesized with 0.1% em massa, 0.3% em massa, and 0.5% em massa of rGO from
the dispersion of its particles in the polymeric matrix, with the aid of an ultrasonic bath,
and applied by a high pressure gun to the metallic substrates. The substrates were
sanded, then cleaned and dried before the coating application. SEM analyses were
performed on the surface of the applied coatings to visualize defects that facilitate the
onset of the corrosive process. It was possible to observe that there was a decrease
in the amount of flowing defects, stains, impregnation of solid materials, and pores on
the surface of the samples as the rGO concentration increased up to 0.3% em massa
in the coatings. This is due to the fact that this nanomaterial preferentially allocates
itself to these defects, thus increasing the diffusive path of the corrosive electrolyte.
Furthermore, correlating this work with a study and realizing the proximity of the results
obtained, the high potential of the prepared nanocomposite coatings for improving
corrosion resistance was noted. |
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