In order to provide sustainable corrosion resistance of casings in areas of geothermal deep wells
materials designed for such applications have been evaluated regarding their suitability in a first
combined project of corrosion, geology and materials scientists.
8 different materials were evaluated by exposure and electrochemical tests. 2 of those materials were
carbon steels, 2 highly alloyed stainless steels, 2 Ni-based alloys and 2 based on titanium. Tests were
performed in an artificial geothermal fluid, which composition based on a reference analysis of a real
Tests showed different corrosion behavior of the materials selected. The limitations of suitability were
determined. Based on the test results recommendations for materials selection were given for applying
parts made of these materials for geothermal sites.
The test results, presented in this paper, will be used for designing new geothermal sites. They are
functioning as a base for a future extended test program.
Keywords: stainless steel, Ni-alloy, Ti-alloy, Geothermal, Corrosion