INVESTIGADORES
BARRACO DIAZ Daniel Eugenio
artículos
Título:
Study of the spontaneous oxidation of sodium in air by EPMA and Monte Carlo simulations
Autor/es:
OLIVA, F.Y.; LEIVA, E.P.M.; LENER, G.; BARRACO, D.E.; TRINCAVELLI, J.C.
Revista:
APPLIED SURFACE SCIENCE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2019 vol. 480 p. 1093 - 1099
ISSN:
0169-4332
Resumen:
The growth of the corrosion layer occurring when a sodium surface is exposed to air under room conditions wasstudied considering the ratio between O − Kα and Na − Kα characteristic peak intensities from the X-rayemission spectrum collected in a scanning electron microscope for different exposure times of metallic sodium toair. Comparison between experimental results and Monte Carlo simulations leads to the conclusion that Naoxidation in air proceeds in two stages: at relatively short times (up to 6.5 s) a Na-rich layer of composition Na2Ois formed. At longer times the oxide layer evolves through reaction with oxygen to a composition that can bedescribed by the stoichiometry Na2O2. While the first of these processes seems to be limited by the reaction ofthe oxygen molecule with sodium, the second one appears to be limited by oxygen diffusion in the growing layer
