A model to evaluate the electrochemical corrosion potential (ECP) and corrosion rate of stainless steel in neutral water was developed by coupling a static electrochemical analysis and a dynamic oxide layer growth analysis. ECP is much affected not only by water chemistry conditions but also by the oxide layers that develop on the metal surface. As an example application of the model, the effects of oxide layers on ECPs were calculated and a good agreement with the measured results was shown. Major conclusions obtained using the coupled model were as follows:
The effects of H2O2 and O2 concentrations on ECP were successfully explained as the effects of oxide layer growth.
Decreases in ECP due to neutron exposure were explained well by radiation-induced diffusion in the oxide layers.
Hysteresis of ECP was well explained by the coupled model.
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