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 well.

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.

Subject
Geothermal energy, Materials, Deformation, Corrosion rate, Repassivation potentials, Free corrosion potential, Lead, Fluids, Crevice corrosion, Pitting, Oxygen, Titanium alloys, Alloys
Keywords:
stainless steel, Ni-alloy, Ti-alloy, Geothermal, Corrosion
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2009
GOV
You do not currently have access to this content.