Corrosion Resistance of High-Alloyed Materials in Artificial Geothermal Brines
- Key words
- steel, geothermal, brine, salt solution.
- Conference
- European Geothermal Conference
- Year
- 2013
- Session
- 6 Hydrothermal Systems – Applications (HS2-4)
- Language
- English
- Paper number
- HS4-27
Full text
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Abstract
The corrosion behavior of different high-alloyed metals including duplex and austenitic stainless steels as well as a nickel alloy have been evaluated in artificial geothermal brines simulating the conditions in the Upper Rhine Graben and the Northern German Basin, some locations with geothermal potential in Germany. The suitability of X2CrNiMo-22-5, X2CrNiMoCuWN25-7-4, X1CrNiMoCu32-28-7 and NiCr23Mo16Al in these geothermal brines obtained by electrochemical measurements and exposure tests is limited. The nickel alloy NiCr23Mo16Al shows an excellent corrosion resistance against pitting corrosion. Excluding its high cost, it is a very good alternative to be used in the construction of geothermal facilities having highly saline brines. Stainless and duplex steels exhibit a limited corrosion resistance concerning pitting and crevice corrosion
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