Influencia de la implantación iónica de silicio en el comportamiento frente a la oxidación de las aleaciones austeníticas Fe-30Mn-5AI y Fe-30Mn-5AI-9Cr R Pérez*, F.J. Pérez**, C. Gómez** y P. Adeva*
ResumenEn el presente trabajo se ha evaluado el efecto de la implantación iónica de átomos de silicio en el comportamiento frente a la oxidación al aire, entre 600 y 800 °C, de la aleación Fe'30Mn'5Al, con y sin adiciones de un 9 % de cromo. La implantación con silicio aumenta ligeramente la velocidad de oxidación, pero no modifica las distintas etapas por las que transcurre. La concentración de silicio en la superficie no pennite generar una capa protectora de SÍO2 continua y retrasa la formación de la capa de alúmina. Además, la implantación del silicio tampoco mejora la adherencia de la capa de los productos formados. Ello, se debe a que el SÍO2 no se sitúa en la intercara entre la capa de óxido y la aleación.Palabras clave Oxidación. Implantación iónica. Elementos de aleación. Aceros inoxidables.
Influence of silicon-ion implantation on the oxidation behaviour of austenitic Fe-30IVIn-5AI and Fe-30IVIn-5AI-9Cr alloys
AbstractIn the present work the influence of silicon ion implantation on the oxidation behaviour in air between 600 and 800 °C of an austenitic Fe--30Mn'5Al with and without 9 % Cr additions has been evaluated. Silicon ion implantation increases slightly the oxidation rate but the different stages of the oxidation are not modified substantially. Silicon content on the surface of the alloy does not result in the formation of a continuous protective SÍO2 layer. In addition, the establishment of a protective alumina layer is delayed. Furthermore, silicon does not improve the adherence of the oxide scale, since the SÍO2 is not located at the scale/metal interface.
A study of the corrosion kinetics of a 12Cr-lMo-0.3V-0.2C stainless steel, at temperatures between 973K and 1273K, was carried out. The kinetic laws that rule the process and the corresponding constants for each temperature were determined. The relations k = f(T) and η = f(T) were also established for the kinetic laws obtained (y" = k). The results were justified by the microstructural changes that were observed during the heat treatment, with an acceptable corrosion behaviour of the materials being observed when the materials were tested at temperatures below 973K.
Influence of the Mixing Procedure and the Copper Proportion on the Corrosion Resistance of Fe-Cu Sintered Products in SO2 Contaminated Atmospheres. -By a powder mixing procedure consisting of cementation of Cu on Fe particles from an aq. solution of CuSO4, the level of structural homogeneity of Fe-Cu sintered products is substantially improved as compared to mechanical mixing. For the cemented samples the corrosion rate in SO2-contaminated atm. is in average by 50% lower than in those produced by mechanical agitation. The corrosion resistance increases with increasing Cu concentration and is higher in all cemented samples. For the latter the corrosion resistance at 1273 K is of the same order as for samples prepared by mechanical stirring at 1472 K. -(OTERO, E.; PARDO, A.; LAGUNA, M.; PEREZ, F.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.