Pourbaix Diagram in Corrosion Science

FIGURE 9.2 Pourbaix diagram of A1 assuming all activities of aqueous species equal 10 . (Adapted from Jones, D.A., Principles and Prevention of Corrosion, 2nd ed., Prentice Hall, Upper Saddle River, NJ, 1996 Pourbaix, M., Atlas of Electrochemical Equilibria in Aqueous Solutions, NACE, Houston, TX, 1974.) 

Note that Eh cannot be measured easily so there is a challenge of comparability between the caleulated and observed Eh values. 

---