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Metals 2019, 9(3), 331; https://doi.org/10.3390/met9030331

Corrosion Behaviour of L80 Steel Grade in Geothermal Power Plants in Switzerland

1
Institute for Building Materials (IfB), ETH Zurich, Stefano-Franscini-Platz 3, 8093 Zurich, Switzerland
2
Department of Chemical and Geological Sciences, University of Cagliari, 09100 Monserrato (CA), Italy
*
Author to whom correspondence should be addressed.
Received: 20 January 2019 / Revised: 5 March 2019 / Accepted: 7 March 2019 / Published: 15 March 2019
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Abstract

In Switzerland, deep geothermal energy can give a promising contribution to the future energy scenario. However, the expertise in operational issues of deep geothermal power plants is limited, and technical challenges, such as corrosion, are a determining factor for their reliable and long-term operation. In this work, two representative fluids of optimal geothermal conditions in Switzerland were studied. The corrosiveness of the solutions was assessed using two experimental setups that allow investigating the range of temperatures and pressures that apply to the reservoir and power plant conditions. The corrosion behaviour of API L80 steel was analyzed by means of electrochemical measurements (at 100 and 200 C ) and of gravimetric tests (at 100 C ). After the tests, the morphologies and composition of the corrosion products were obtained by scanning electron microscopy (SEM) coupled with energy dispersive X-Ray (EDX) and X-Ray diffraction (XRD). Results show that corrosion rates are significantly high at 100 C in environments with a chloride concentration of around 600 mg/L and pH around 7. The corrosion products deposited on the metal surface mainly consist of magnetite and/or hematite that might potentially form a protective layer. This study gives a first insight of the potential corrosiveness of geothermal fluids in Switzerland. View Full-Text
Keywords: deep geothermal energy; operational issues; materials degradation; carbon steel; autoclave; electrochemistry deep geothermal energy; operational issues; materials degradation; carbon steel; autoclave; electrochemistry
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Vallejo Vitaller, A.; Angst, U.M.; Elsener, B. Corrosion Behaviour of L80 Steel Grade in Geothermal Power Plants in Switzerland. Metals 2019, 9, 331.

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