Application of a submerged impinging jet for corrosion studies: development of models for the impedance response

A model was established for the impedance response associated with convecti ve diffusion to a disk electrode subjected to a submerged impinging jet. Th e model accounted for a finite Schmidt number by employing a series expansi on in terms of Sc-1.3. The model was incorporated into a quantitative analy sis of impedance data for the corrosion of a steel disk in brine saturated with CO2 This work showed that the impedance response was influenced by dif fusion through a stagnant layer as well as through a convective region. The Schmidt number obtained was very large, suggesting that the thick layer, o bserved by in situ video microscopy, is a colloidal gel. (C) 2001 Elsevier Science Ltd. All rights reserved.