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Corrosion Inhibitor Evaluation Using Autoclave Electrochemical Measurements in Geothermal Brine
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st Geoscience & Engineering in Energy Transition Conference, Nov 2020, Volume 2020, p.1 - 5
Abstract
Summary
To protect a geothermal plant of the Upper Rhine Graben, the performance of commercially available corrosion inhibitors was evaluated in laboratory. Experiments, and in particular electrochemical measurements, were successfully conducted at 170°C, 22 bar, in autoclave to measure steel corrosion rates in utilization conditions, and to reproduce the scale deposits observed on-site. Among the inhibitor products the least toxic for aquatic life, one was able to reduce the steel corrosion rate in geothermal brine from 80 to 30 µm/year at 80°C, and from 450 to 180 µm/year at 170°C.
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