Evaluación del desempeño del recubrimiento nanoestructurado de ZrN-Si sobre acero inoxidable 316L mediante técnicas electroquímicas
Nanostructured coatings have been widely used by industry to improve the surface properties of materials. Among the most widely used coatings are transition metal nitrides with added silicon. These materials in the form of coatings have shown very good physical and chemical properties. In this work,...
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| Autores principales: | , |
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| Otros Autores: | |
| Formato: | Trabajo de grado (Pregrado y/o Especialización) |
| Lenguaje: | spa |
| Publicado: |
Universidad Antonio Nariño
2022
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| Materias: | |
| Acceso en línea: | http://repositorio.uan.edu.co/handle/123456789/7205 |
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| Sumario: | Nanostructured coatings have been widely used by industry to improve the surface properties of
materials. Among the most widely used coatings are transition metal nitrides with added silicon.
These materials in the form of coatings have shown very good physical and chemical properties.
In this work, the effect of silicon (Si) incorporation on the chemical composition, microstructure
and corrosion resistance of zirconium nitride (ZrN) coatings with different silicon contents was
investigated. The elemental chemical composition was obtained by energy dispersive X-ray
spectroscopy (EDS) technique and the results showed that the atomic content of silicon in the
coatings was increasing as a function of silicon pellets: for one silicon pellet 6 at.%, two pellets 11
at.% and three pellets 21 at.%. The microstructure of the samples was studied by X-ray diffraction
technique (XRD). For the coating with a silicon atomic content of 0.0 at.%., the presence of a ZrN
nanocrystalline phase with an fcc structure was observed. However, with the incorporation of
silicon, the diffraction peaks were broad and of lower intensity, which is related to the formation
of an amorphous Si3N4 phase and a decrease in the size of the ZrN crystallite. The functionality of
the ZrN-Si coatings was evaluated from corrosion tests, using electrochemical techniques of
potentiodynamic polarization and electrochemical impedance spectroscopy through equivalent
electrical circuit fitting. The results showed that as the atomic content of silicon in the ZrN coating
increased, the performance in the saline medium improved due to the formation of an amorphous
Si3N4 phase that does not allow the diffusion of the electrolyte towards the substrate. Therefore,
these coatings have potential applications as protective coatings. |
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