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9.5: Summary

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    In this package:

    • the concepts of equilibrium potential and their measurement are introduced.
    • electrochemical half-cells are defined and treatment of electrochemical equations demonstrated.
    • the physical and chemical processes which lead to aqueous corrosion are examined.
    • the Nernst Equation has been derived and the way in which it links measured potentials at various conditions with standard equilibrium potentials is discussed.
    • the way in which some electrochemical reactions have equilibrium potentials that vary as a function of pH is considered and the concept and derivation of a Pourbaix diagram introduced.
    • through the use of specific examples, the characteristics of Pourbaix diagrams and their uses are examined. The stability of water is demonstrated through the use of the Pourbaix diagram.
    • cathodic and anodic reaction lines on Pourbaix diagrams are discussed and the way in which a point on the diagram corresponds to physical corrosion examined.

    Going further


    • J.M. West: "Basic Oxidation and Corrosion"
    • Ellis-Horwood L.L. Shreir, R.A. Jarman and G.T. Burstein: "Corrosion", third edition, Butterworth-Heinemann


    9.5: Summary is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by Dissemination of IT for the Promotion of Materials Science (DoITPoMS).

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