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In geothermal energy production facilities, the corrosion resistance and therefore the longevity of engineering steels is a vital factor of costs. DSS X2CrNiMoN22-5-3, a standard stainless duplex steel (AISI 2205) promises to withstand both, highly aggressive corrosive environment and mechanical load. Its electrochemical potential was monitored in-situ during corrosion fatigue experiments using a special corrosion fatigue test set-up and corrosion chamber (33 Hz, 369 K at a theoretical rate of saline water flow ω0 = 1.7 × 10^ − 3 m/s) allowing for in-situ monitoring of temperature, potential, frequency and pH of the surrounding geothermal brine. The agreement of the typical decline of the electrochemical potential with initiation as well as increasing propagation velocity of the crack as a function of the absolute potential are demonstrated - possibly enabling early prediction of failure.

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Decreasing Frequency and Electrochemical Potential as Means to Estimate Early Corrosion Fatigue Failure

  • 会议论文

  • 发表日期：

    2025年

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  • Marcus Wolf,
  • Anja Pfennig

摘要

In geothermal energy production facilities, the corrosion resistance and therefore the longevity of engineering steels is a vital factor of costs. DSS X2CrNiMoN22-5-3, a standard stainless duplex steel (AISI 2205) promises to withstand both, highly aggressive corrosive environment and mechanical load. Its electrochemical potential was monitored in-situ during corrosion fatigue experiments using a special corrosion fatigue test set-up and corrosion chamber (33 Hz, 369 K at a theoretical rate of saline water flow ω0 = 1.7 × 10^ − 3 m/s) allowing for in-situ monitoring of temperature, potential, frequency and pH of the surrounding geothermal brine. The agreement of the typical decline of the electrochemical potential with initiation as well as increasing propagation velocity of the crack as a function of the absolute potential are demonstrated - possibly enabling early prediction of failure.