Avaliação da eficiência da espécie vegetal ouratea parviflora como inibidor de corrosão em aço carbono
The impacts of corrosion are frequent and occur in various activities. There are several ways of combating impacts, among them the use of micro-emulsified system have been targeted as corrosion inhibitors. Although they are effective in the corrosion control, some have high cost and are toxic to...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25530 |
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| Resumo: | The impacts of corrosion are frequent and occur in various activities. There are several
ways of combating impacts, among them the use of micro-emulsified system have been
targeted as corrosion inhibitors. Although they are effective in the corrosion control, some
have high cost and are toxic to the environment, making its use questionable. In order to
fulfill the growing demand for corrosion inhibitors, the objective of the present work was to
perform a research about the inhibitory action of almonds oil and hydro-alcoholic extract from
vegetal specie Ouratea parviflora. The extract was evaluated in free formand in a microemulsified
system, containing the oil of the almonds in your composition, with different
concentrations, regarding the corrosion inhibition efficiency into a saline medium (NaCl
3.5%). Was used the method Linear Polarization Resistance method, also determining the
behavior and the isotherm of the metal/inhibitor adsorption process. According to the
obtained results, the maximum inhibition efficiencies were observed at 67.70% (12.5 ppm),
77.94% (200 ppm) and 85.66% (200 ppm) to the free hydro-alcoholic extract, saline microemulsified
system (SME-S) and saline micro-emulsified system with extract (SME-S-EB),
respectively. In addition, all the experimental data from the adsorption process fitted the
Langmuir isotherm. According to the data calculated from Gibbs free energy, it was detected
a spontaneity of the adsorbent inhibitors used in different conditions on the steel surface. The
study of getting of inhibitors used in different conditions under the sustainability bias
confirmed that these formulations can be considered as sustainable. The results showed that
the hydro-alcoholic extract of Ouratea parviflora evaluated in free form and in a
microemulsion system containing the oil of the almonds of the same plant species, can be
used as alternative sources in the formulation of corrosion inhibitors. |
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