Argentum Solutions, Inc.
Sterling guidance on corrosion and materials degradation
| Potential-pH Diagrams |
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| Intelligent Tools |
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| Corrosion Calculator |
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| Corrosion Economics Estimator |
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David C. Silverman |
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Potential-pH diagrams, Pourbaix diagrams, or, as they are sometimes called, EMF-pH diagrams can be powerful aids in assessing the thermodynamic state of a metal in the presence of water and other interacting ionic components important in a corrosion process. This state may be considered the most stable thermodynamic state of the system as determined by the temperature, pressure, pH, potential, and interacting ions. These diagrams are computer generated using tabulated bulk phase thermodynamic data. As such, the diagrams are limited in two ways, (1) by the availability and accuracy of these data and (2) by the fact that bulk thermodynamic data is being used to estimate the thermodynamics of processes occurring at the metal-solution interface. Every attempt has been made to develop an internally consistent data base. The web application THERMEXPERT has been developed to provide an internet-accessible tool for generating and presenting potential-pH diagrams. In addition, all figures in the tutorial can be expanded and printed. This tutorial has been written to provide the following:
Argentum Solutions would like to hear from users regarding their experience with this application including thoughts about improvements and additional metals and ions that are desired. Please send comments to Argentum Solutions |
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David C. Silverman, Ph.D. - Primary Consultant |