Tagarelli Gaete, Victor E. (2018) Obtención y caracterización de recubrimientos micro y nano estructurados mediante técnicas electrolíticas de deposición utilizando pulsos de tensión de duty y frecuencia variable. / Micro and nano estructured coatings made by electrolytic techniques with PWM technology and variable frequency. Maestría en Ingeniería, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
Mediante el uso de técnicas electroquímicas de deposición se obtuvieron recubrimientos de cromo. Los films fueron obtenidos en condiciones de corriente continua y con secuencias de pulsos de tensión. Respecto de esta condición, se realizaron trabajos modificando dos características de ella, el ciclo de trabajo y la frecuencia, mediante técnicas de modulación de ancho de pulsos (PWM). Se trabajó bajo la hipótesis que los parámetros eléctricos de la señal aplicada, modifican las condiciones dinámicas del proceso de electrodeposición, creando un modelo competitivo entre las velocidades de los fenómenos que ocurren en la zona de la doble capa difusa; y como resultado, se obtuvieron películas con diferentes propiedades físicas, químicas y mecánicas. Los films obtenidos fueron caracterizados mediante técnicas de microscopía electrónica de barrido, espectroscopía de impedancia electroquímica, difracción de rayos X y microdureza Vickers; a partir de ello se pudieron establecer parámetros comparativos para determinar cuál de ellos presenta mejores prestaciones. Los recubrimientos con corrientes continuas resultaron sobresalientes en sus propiedades mecánicas sin embargo su resistencia a la corrosión se ve disminuida por las características microestructurales, aspecto que pudo ser corregido con pulsos de duty intermedio (65%) y bajas frecuencias (menor a 100 Hz). Bajo dichas condiciones se obtuvieron excelentes resultados tanto en propiedades mecánicas como químicas.
Resumen en inglés
Coatings with hard metals were obtained by using electrochemical plating techniques. The films were obtained in conditions of direct current and with sequence of potentiostatic pulses. In order to this signal, work was carried out modifying two characteristics, the pulse-pause relation or duty cycle and the frequency. I worked under the hypothesis that the electrical parameters of the applied signal modify the dynamic conditions of the electrodeposition process, creating a competitive model between the velocities of the phenomena that occur in the area of the diffuse double layer; and as a result films with different mechanical, chemical and physical properties were obtained. The films obtained were characterized by techniques of scanning electron microscopy, electrochemical impedance spectroscopy, X-ray diffraction and Vickers microhardness; from this, it was possible to establish comparative parameters to determine which of them has better benefits. The coatings with continuous currents were outstanding in their mechanical properties however their resistance to corrosion is diminished by their microstructural conditions, aspect that could be corrected with pulses of intermediate duty (65%) and low frequencies (less than 100 Hz). Under these conditions excellent results were obtained in both, mechanical and chemical properties.
| Tipo de objeto: | Tesis (Maestría en Ingeniería) |
|---|---|
| Palabras Clave: | Hardness; Dureza; Corrosion; Corrosión; Morphology; Morfología; Coverings; Recubrimientos; [Electrodeposition; Electrodeposición; Duty; Pulsos] |
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| Materias: | Química > Ingeniería química |
| Divisiones: | Aplicaciones de la energía nuclear > Tecnología nuclear innovativa > Desarrollos electrónicos |
| Código ID: | 790 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 14 Jun 2019 14:45 |
| Última Modificación: | 14 Jun 2019 14:45 |
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