This work focusses on understanding corrosion severity and material performance within model geothermal sulfuric acid (H2SO4)-containing environments. With the use of a tantalum-lined high pressure/high temperature autoclave, the corrosion behavior of N80 carbon steel was compared against duplex stainless steel when exposed to H2SO4 solutions (pH 2-4) at temperatures up to 150°C. Electrochemical linear polarization resistance measurements were implemented to gather real time corrosion kinetic data. Complimentary ex-situ analyses (scanning electron microscopy and white light interferometry) were conducted to understand the corrosion mechanism and quantify localized corrosion rates. A quantitative relationship was identified in terms of pH, temperature and metal corrosion for the selected materials to highlight material capability within such low pH geothermal environments.

Subject
Scanning electron microscopy, Geothermal energy, Materials, Corrosion rate, Materials performance, Sulfuric acid, Autoclaves, Acidity, Steel, Carbon steel, Localized corrosion, Electrochemistry, Linear polarization resistance
Keywords:
Electrochemistry, Carbon steel, Duplex Stainless Steel, Geothermal, Sulfuric Acid
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2024
Association for Materials Protection and Performance (AMPP)
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