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    Thermodynamics of Corrosion for Geothermal Systems

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    Potential-pH diagrams, which summarize the thermodynamic properties of a system, are extensively used for interpreting the corrosion behavior of metals in condensed media. In this paper, E-pH diagrams are presented for iron and nickel in sulfide-containing high-salinity geothermal brine at 25°C and 250°C. The diagrams have been constructed on the assumption of a constant total sulfide constraint which leads to nonlinearity of the equilibrium relationships in potential-pH space. The application of these diagrams in the interpretation of chemical and corrosion processes in geothermal systems is briefly discussed.


    geothermal brine, iron, nickel, thermodynamics, potential-pH diagrams, corrosion, scaling

    Author Information:

    Macdonald, DD
    Professor, Metallurgical Engineering, Ohio State University, Columbus, Ohio

    Committee/Subcommittee: G01.09

    DOI: 10.1520/STP30062S