Influência da concentração de óxido de grafeno reduzido nas propriedades corrosivas e na dureza de revestimentos à base de metal duro aplicado por HVOF
Carbide-based coatings are widely used in the oil and gas industries to increase the useful life of steels. However, these are also subject to oxidation, chemical corrosion and erosion when subjected to working hours with a combination of physical wear processes and chemically aggressive environm...
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| Formato: | Dissertação |
| 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/123456789/55555 |
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| Resumo: | Carbide-based coatings are widely used in the oil and gas industries to increase the
useful life of steels. However, these are also subject to oxidation, chemical corrosion and
erosion when subjected to working hours with a combination of physical wear processes and
chemically aggressive environments. Therefore, the addition of nanoparticles to the
composition of the tungsten carbide-based coating with cobalt can be an alternative, as they
can improve the properties of the carbide, such as wear and corrosion. The anodic polarization
technique allows the electrochemical behavior of a material to be known in the laboratory,
that is, its tendency to remain active or passive, by constructing potential curves as a function
of current and its susceptibility to pitting. In this work, graphene oxide was mixed with
tungsten-cobalt carbide with different weight concentrations of 0, 0.5, 0.75 and 1% and
applied to a 1020 steel substrate using the thermal spray method via HVOF and analyzed in
SEM, Vickers Microhardness Test, in addition to electrochemical cyclic voltammetry tests
also called reverse anodic potentiodynamics to characterize the compositions. Thus, it was
observed that the WC-Co coating with the addition of Graphene Oxide showed an increase in
hardness proportional to the increase in the Graphene Oxide composition and a lower pit
protection potential as the Graphene Oxide composition increases in the samples. |
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