Effect of the segregation-induced potential barrier on gas/solid kinetics. Impact on corrosion kinetics of Zircaloy

The surface vs. bulk defect chemistry of zirconia is considered in terms of electrical properties, such as electrical conductivity (bulk) and work function (surface). The difference between the two is considered in terms of segregation-induced concentration gradients. It is postulated that the transport of charged defects through the interface layer of zirconia may be influenced strongly by the local electric field, which is formed within this layer across the segregation-induced concentration gradients. The effect of this field on the oxidation kinetics of metals and alloys, such as Zircaloy, is considered. (C) 1997 Elsevier Science B.V.