Producción CyT

Passive salt film formation on silver electrodes

Capítulo de Libro

Autoría:

BRUNETTI, VERONICA ; H. M. Villullas ; M. López Teijelo

Fecha:

2000

Editorial y Lugar de Edición:

European Federation of Corrosion by IOM Communications

Libro:

Electrochemical Approach to selected corrosion and corrosion control studies (pp. 237-244)
European Federation of Corrosion by IOM Communications

ISBN:

1861251106

Resumen *

The formation of Ag2CrO4 films on silver electrodes takes place through a dissolution-precipitation mechanism. The early stages of growth of the salt film involve a three-dimensional nucleation process with growth controlled by diffusion of chromate ions. After nucleation, the growth is controlled by the resistance of the electrolyte in the pores of the layer until the surface is almost completely covered. The passive film formed under ohmic control is porous and further growth occurs under diffusion control of chromate ions into the pores. The properties of passivating layers depend on the formation conditions. Changes of the film electric properties with time are associated with variations in the layer structure. Información suministrada por el agente en SIGEVA