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Performance of Nozzle Steels in Biofuel

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Blanco Estupiñan, David Leonardo
Bermudez-Castañeda, Angela
Márquez, Sebastian
Abstract (Spanish)
Evaluar la resistencia a la corrosión de las boquillas de inyección de acero inoxidable bajo ensayo de inmersión en biodiésel, y realizar una caracterización electroquímica bajo soluciones de HNO3. Métodos y materiales: Se realizó la caracterización química del biodiésel para analizar su estabilidad. Se realizaron pruebas de inmersión durante 4 meses, evaluando el acero inoxidable 304 bajo 3 concentraciones diferentes de mezclas de diésel/biocombustible. Además, se realizaron ensayos de polarización con concentraciones de NOx superiores a los niveles medidos en las emisiones de los motores. Resultados y discusión: El uso de biocombustibles en Colombia ha sido impulsado en gran medida por la producción de etanol de origen vegetal. Su uso aporta algunas ventajas relacionadas con la reducción de las emisiones de partículas y gases tóxicos (principalmente, grupos aromáticos, NOx y CO2). Sin embargo, puede producirse una degradación de los materiales cuando están en contacto directo con el biodiésel. Además, se ha informado de solidificación de ceras, que provoca el taponamiento de las boquillas. No obstante, se desconoce si esto influye en la difusión del oxígeno en la solución y, a su vez, afecta a la resistencia a la corrosión del acero inoxidable. Conclusiones: La resistencia a la corrosión del acero inoxidable 304 cambió bajo condiciones de inmersión, aunque su capa protectora no se vio afectada por las concentraciones de NOx registradas en las mezclas de biocombustible.
Abstract (English)
To evaluate the corrosion resistance of stainless-steel injection nozzles under immersion test in biodiesel and perform electrochemical characterization under HNO3 solutions. Methods and materials: Chemical characterization of biofuel was performed to analyze its stability. Immersion tests were carried out for 4 months, evaluating 304 stainless steel under 3 different diesel/biofuel mixtures concentrations. Additionally, polarization tests were done using NOx concentrations above the levels measured from engine emissions. Results and discussion: The use of biofuels in Colombia has been largely driven by ethanol production from vegetable sources. Their use brings some advantages related to reducing emissions of particles and toxic gases (mainly aromatic groups, NOx, and CO2). However, degradation of materials can occur when they are in direct contact with biodiesel. Furthermore, solidification into waxes, which leads to plugging of nozzles, has been reported. However, it is unknown whether this influences oxygen diffusion in the solution and, in turn, affects the corrosion resistance of stainless steel. Conclusions: The corrosion resistance of the 304 stainless steel changed under immersion conditions, even though its protective layer was not affected by the NOx concentrations registered in the biofuel mixtures.
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13 páginas
URI: https://repositorio.escuelaing.edu.co/handle/001/3144
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AK - Diseño Sostenible en Ingeniería Mecánica – DSIM
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