A Coupled Model of Corrosion of the Steam Generator Heat Transfer Tube
In this paper, a mechanism model of the coupling of ion migration and fluid dynamics of the heat transfer tube on the secondary side of the steam generator is established. The accuracy of the model was verified, the sensitivity of the migration process of impurity ions to metal corrosion was analyzed and discussed. The results show that migration distance of impurity ions (MDIIs) is highly sensitive to metal corrosion. MDIIs determines the electrochemical reaction (ER) rate of the metal surface. The controlling factor of ER on metal surface changes at 14 m/s, and does not change with pH. The corrosion of the metal surface is more affected by H+ concentration than the overpotential. In this study, a coupling mechanism model based on the corrosion of the heat transfer tube of a SG is proposed for the first time