Oxygen injection during fast vs slow passivation in aqueous solution

The typical defect reactions at the metal/oxide interface, which explain growth and breakdown of passive oxide films in corrosion, include creating metal oxygen vacancies. While creation coalescence vacancies are well documented, there relatively few observations on nanoscale details transport near interface. We report here a new mechanism injection into metal. Fast slow passivation (i.e., corrosion involving both film direct dissolution) NiCr NiCrMo alloys was performed by galvanostat experiments 0.1 M NaCl (pH 4) deaerated solution. Localized regions an unexpected nonequilibrium metal-based solid solution were observed beneath outer (externally formed) oxides, saturated atoms distorted fcc metallic lattices. Oxygen is more significant fast rate due to large current density for alloy. In this case, high volume rock salt Ni(Cr)O nanocrystals O-rich Ni(Cr) substrate, consistent with greater susceptibility chloride-induced found potentiostat experiments. addition Mo promotes formation corundum phase layer NiCrMo, changes as diffusivity through across