51313-02327-Corrosion Resistance of High-Alloyed Materials in Artificial Geothermal Fluids

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Product Number: 51313-02327-SG

ISBN: 02327 2013 CP

Author: Ralph Baessler

Publication Date: 2013

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Since geothermal wells are a feasible energy source to replace fossil fuel supply many technologies have been developed to take advantage of geothermal energy. Nevertheless service conditions in geothermal facilities are due to the chemical composition of hydrothermal fluids and temperatures in many cases extreme in terms of corrosion. Therefore materials selection based on preliminary material qualification is essential to guarantee a secure and reliable operation of the facilities.

This contribution deals with the evaluation of the corrosion behavior of different high-alloyed metals including duplex and stainless steels as well as a nickel-based-alloy in artificial geothermal fluids simulating the conditions in the Upper Rhine Graben and the Northern German Basin locations with geothermal potential in Germany.

The limitations of suitability of duplex steel F51 super duplex stainless steel F55 alloy 31 and alloy 59 in these geothermal fluids obtained by electrochemical measurements and exposure tests are presented. While alloy 59 shows an excellent corrosion resistance against pitting corrosion and represents excluding their high cost a very good alternative to be used in the construction of geothermal facilities stainless and duplex steels exhibit a limited corrosion resistance concerning pitting and crevice corrosion.