Electrochemical study of the corrosion of different alloys exposed to deaerated 80°C geothermal brines containing CO2
| Autor: | Niklas Mundhenk, Hagen Steger, Roman Zorn, Petra Huttenloch, Thomas Kohl, R. Bäßler |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Passivation General Chemical Engineering Alloy Metallurgy chemistry.chemical_element General Chemistry engineering.material Corrosion Metal Ennoblement chemistry visual_art Pitting corrosion engineering visual_art.visual_art_medium General Materials Science Geothermal gradient Titanium |
| Zdroj: | Corrosion Science. 84:180-188 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2014.03.027 |
| Popis: | Corrosion of metallic engineering materials accounts for problems during geothermal operation in the Upper Rhine Graben (URG). Herein, we study the electrochemical behaviour of various metal alloys in an 80 °C simulated geothermal environment by using potentiodynamic polarisation and open-circuit potential measurements. Two different natural geothermal waters from URG geothermal sites were used for the experiments. The measurements reveal spontaneous passivation to be a key process for all alloys. This ennoblement protects more noble alloys from significant corrosion (e.g. titanium gr. 2, alloy 625) and brings less noble alloys to failure, mostly due to pitting corrosion (e.g. 316L). |
| Databáze: | OpenAIRE |
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