Corrosion testing of materials in simulated superheated geothermal environment
Andri Ísak Þórhallsson, Andri Stefánsson, Danyil Kovalov, Sigrún N. Karlsdóttir
Abstract
This paper reports the results of corrosion study for carbon steel, austenitic stainless steel, as well as titanium and nickel-based alloys which were tested in a simulated superheated geothermal environment (SSGE) in flow-through reactors to investigate the corrosion behaviour to aid in the future material selection for high temperature deep geothermal application. The testing fluid was superheated steam (T = 350 °C and P = 10 bars gauge) containing H2S, CO2 and HCl with condensate of pH = 3. The corrosion rate for all samples was negligible but carbon steel was prone to localized damage under a magnetite film with a sulphur rich sublayer.
Topics & Concepts
CorrosionGeothermal gradientMetallurgyMaterials scienceSuperheatingSuperheated steamCarbon steelAusteniteMagnetiteAustenitic stainless steelMicrostructureGeologyCondensed matter physicsPhysicsGeophysicsHigh-Temperature Coating BehaviorsSubcritical and Supercritical Water ProcessesCorrosion Behavior and Inhibition