Polarization Curve of Metal Corrosion

FIG U RE 9.3 Typical current density-applied potential curve showing three main processes in corrosion (1) activation, (2) passivation, and (3) transpassivation. 

Note that Mez+zMe can significantly deviate from Mez+zMe, and it depends on the corrosion environment, including concentration of species and temperature. Pressure can also affect Mez+zMe but to a smaller extent if the pressure is not too high, say, below 100 bar. However, the pressure effect can significantly increase when temperature is elevated above 200°C. 

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