A mathematical model for the delamination of coating from active metal was developed in the presence of multiple electrochemical reactions, homogeneous reactions, and precipitation of corrosion product. The computational results illustrate that the propagation of potential front is controlled by the production of OH- ions along the metal-coating interface, while that of porosity front is limited by the rate constant of bond-breakage reactions. The movement of the two fronts are close when the time constant associated with breaking bonds is small as compared to that of diffusion and migration processes. When the time constants of bond-breakage and coating degradation are large, the velocity difference between the potential and porosity fronts becomes large. The delamination rate and delamination mechanism predicted from the model are in good agreement with experimental interpretations. A systematic sensitivity analysis for the fitting parameters used in the program was conducted and the results show that the computations are most sensitive to the parameters in the porosity-pH relation. (C) 2008 The Electrochemical Society.