theory of metal passivation

And it is thermodynamically favourable for metal to dissolve as a result of these process.This is one of the main factor of stability of metal in aggressive environment.It is known that, there is no unified model of passivation.In case of metal passsivation determining role plays water molecule.Strong electric field. It define the transform of metal to metal oxide: [pic] .Energetic inhomogeneity of metal surface.Thus the processing of the first thin superficial layer of metal in oxide is finished.Such phenomenon was first observed by M. Faraday.Equilibrium exchange on the border with solution in which take part the ion OH- and Oox.Number of nonequilibrium vacancy in the passivaing oxide lattice.