INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Impact of Nitrites and Phosphates on the Electrical Properties of the Passive Film Formed on Steel in Concrete Pore Simulating Solutions
Autor/es:
M. VÁZQUEZ; M.B. VALCARCE; M.A. FRONTINI
Revista:
ECS-Transactions
Editorial:
The Electochemical Society
Referencias:
Año: 2017 vol. 80 p. 621 - 633
ISSN:
1938-6737
Resumen:
The electronic properties of passive films grown at open circuitpotential for 24 h and 7 days in pore simulating solutions arecorrelated to the inhibiting effect of nitrite and phosphate ions inchloride-rich alkaline solutions. Electrochemical impedance andMott-Schottky plots were used to investigate the electronicproperties of the films grown. Changes in composition wereanalyzed by X-ray photoelectron spectroscopy.Both anions are excellent inhibitors. However, the donor density(ND) decreases when nitrites are incorporated and remains constantwhen phosphates are added. ND increases with ageing time. Thesedifferences are interpreted in terms of the composition of eachsurface layer.
