Etude des oxydes superficiels du fer lors de l\u27 oxydation anodique par la methode de polarisation photoelectrique

Abstract

The nature and the degree of passivation of iron in 1 N Na2S04 was studied using the photoelectric polarization method. The shift in composition of the oxide from the stoichiometric composition Fe304, in the domain of active dissolution, into the y - Fe203 form by oxygen adsorption favors passivity. The sorption of oxygen leads to the decrease of the concentration of 3d electrons in the oxide exerting an inhibitory effect on the dissolution of iron