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Rev. LatinAm. Metal. Mat. 2020, 40(1): 36-48

OXIDACION CICLICA A 800°C DE ACERO INOXIDABLE AISI 304L SENSIBILIZADO A LA CORROSIÓN INTERGRANULAR Y RECUBIERTO CON Ni-P, Ni-P-W Y Ni-P-W-MAGNETITA

Jacqueline Corredor Acuña, Erick German Yanza Hurtado, Dora Elizabeth Chaparro Chaparro

Online: 20-06-2020

GA-966

Abstract


Se estudió la obtención de recubrimientos auto-catalíticos de Ni-P, Ni-P-W y Ni-P-W-magnetita sobre acero inoxidable AISI 304L sensibilizado a la oxidación intergranular, y la cinética de crecimiento de la escama de óxidos cuando las probetas fueron expuestas a la oxidación cíclica a la temperatura de 800°C. En estos estudios cinéticos se evaluaron los cambios de peso de las muestras durante 100 horas, en ciclos de 10h. Las cinéticas demostraron que con los recubrimientos, se redujo significativamente la pérdida continua de peso observada en el acero sensibilizado desnudo. El acero recubierto con Ni-P-W-magnetita fue el que perdió menos peso de entre las muestras evaluadas. Mediante estudios de difracción de rayos X de las escamas de óxidos, se determinaron y cuantificaron las fases formadas al final de los ciclos de oxidación; estos resultados demostraron, que la escama crecida sobre el acero desnudo estaba constituida principalmente de Magnetita (Fe3O4) y óxido de níquel (NiO), y que la escama sobre el acero sustrato recubierto de Ni-P-W-magnetita compuesta de Magnetita, Hematita y Níquel Tungsteno (Ni0.9W0.08) fue la que presentó mayor naturaleza protectora en las condiciones del estudio.



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