9.5: Summary
- Page ID
- 8224
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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
Books
- J.M. West: "Basic Oxidation and Corrosion"
- Ellis-Horwood L.L. Shreir, R.A. Jarman and G.T. Burstein: "Corrosion", third edition, Butterworth-Heinemann
Websites
- Kinetics of Aqueous Corrosion TLP - introduces the mechanism of aqueous corrosion and the associated kinetics (DoITPoMS).