The present work reports the study of high-temperature corrosion of different alloys, such as AISI 310, AISI 316L e HAYNES® HR-120®, under oxidizing (air) and carburizing (CO/H2/CO2) atmospheres, by means of a crystal microbalance (EQCM). Conventional techniques, like EIS, SEM/EDX, XPS, XRD and RAIR, were used to characterize the corrosion products formed on the surface of bulk alloys after the thermal treatments. The followed approaches converge to indicate HR-120 as less susceptible to degradation, whereas AISI 316L as more reactive in both aggressive environments. Nonetheless, EIS results pointed out that the corresponding oxide grown in atmospheric air is less porous and more protective.
Il presente lavoro riporta uno studio della corrosione ad alta temperatura di diverse leghe, quali AISI 310, AISI 316L e HAYNES® HR-120®, in atmosfera ossidante (aria) e carburizzante (CO/H2/CO2) tramite l'utilizzo di una microbilancia a cristalli (EQCM). Le proprietà dei prodotti di corrosione, formatisi sulla superficie dei materiali bulk, sono stati caratterizzati mediante tecniche convenzionali quali EIS, SEM/EDX, XPS, XRD e RAIR. Gli approcci esplorati convergono nell'indicare che la lega HR-120 risulta essere la meno suscettibile alla degradazione, mentre l'acciaio 316L risulta essere il più reattivo nei due ambienti considerati. Tuttavia, le prove EIS di quest'ultimo hanno indicato che l'ossido termico promosso in aria atmosferica risulta meno poroso e più protettivo.
High-temperature corrosion study of different alloys by crystal microbalance and conventional techniques|Studio della corrosione ad alta temperatura di diverse leghe mediante microbilancia a cristalli e tecniche convenzionali
Casaletto MP;
2017
Abstract
The present work reports the study of high-temperature corrosion of different alloys, such as AISI 310, AISI 316L e HAYNES® HR-120®, under oxidizing (air) and carburizing (CO/H2/CO2) atmospheres, by means of a crystal microbalance (EQCM). Conventional techniques, like EIS, SEM/EDX, XPS, XRD and RAIR, were used to characterize the corrosion products formed on the surface of bulk alloys after the thermal treatments. The followed approaches converge to indicate HR-120 as less susceptible to degradation, whereas AISI 316L as more reactive in both aggressive environments. Nonetheless, EIS results pointed out that the corresponding oxide grown in atmospheric air is less porous and more protective.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.