A Mechanistic Model for C02 Corrosion with Protective Iron Carbonate Films |
by |
Srdjan Nesic*, Magnus Nordsveen*, RolfNyborg and Aage Stangeland§ |
Abstract |
EIS The
mechanistic model of uniform CO2 corrosion is presented which covers:
electrochemical reactions at the steel surface, diffusion of species between
the metal surface and the bulk including diffusion through porous surface
films, migration due to establishment of potential gradients and homogenous
chemical reactions including precipitation of surface films. The model
can predict the corrosion rate, as well as the concentration and flux
profiles for all species involved. Comparisons with laboratory experiments
have revealed the strengths of the model such as its ability to assist
in understanding of the complex processes taking place during corrosion
in the presence of surface films. |