SYMPOSIA PAPER Published: 01 January 1980
STP30062S

Thermodynamics of Corrosion for Geothermal Systems

Source

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.

Author Information

Macdonald, DD
Metallurgical Engineering, Ohio State University, Columbus, Ohio
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Details
Developed by Committee: G01
Pages: 10–23
DOI: 10.1520/STP30062S
ISBN-EB: 978-0-8031-4785-0
ISBN-13: 978-0-8031-0705-2