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Corrosion Testing of Coating Materials for Geothermal Turbine Application

Development is needed for new materials to extend the life/reliability of surfaces used in geothermal turbines. Results of Tests and inspection of coatings on low carbon steel including; visual inspection, microstructural and chemical composition analysis with scannoing electro microscopy and energy dispersive x-ray spectroscopy.

Product Number: 51317--9185-SG
ISBN: 9185 2017 CP
Author: Kolbrun Ragnarsdottir
Publication Date: 2017
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$20.00
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Development is needed for new materials and methods for material surfaces of geothermal steam turbines to extend their lifetime and reliability. A test unit was designed so that steam flows directly from the wellhead into the test unit through a nozzle where the steam is flashed at high velocity on the target area simulating the effect of erosion and erosion-corrosion in geothermal steam turbines in Iceland. Well HE-29 at Hellisheiði geothermal power plant was selected for testing. The steam from the wellhead had temperature around 210°C with 18 bar pressure and contained dissolved gases including H2S and CO2. In the preliminary experiment 12 low carbon steel plates were coated with different spraying methods and materials to obtain protective layers with improved erosion-corrosion resistance in geothermal turbine environment. The experiment will describe explore which of the tested spraying method and material is the most suitable for this application. This paper reports the first results from the tests and inspection of the coatings on the low carbon steel; including visual inspection microstructural and chemical composition analysis with SEM and XEDS.

Key words: coated carbon steel, geothermal environment, turbine, erosion-corrosion.

Development is needed for new materials and methods for material surfaces of geothermal steam turbines to extend their lifetime and reliability. A test unit was designed so that steam flows directly from the wellhead into the test unit through a nozzle where the steam is flashed at high velocity on the target area simulating the effect of erosion and erosion-corrosion in geothermal steam turbines in Iceland. Well HE-29 at Hellisheiði geothermal power plant was selected for testing. The steam from the wellhead had temperature around 210°C with 18 bar pressure and contained dissolved gases including H2S and CO2. In the preliminary experiment 12 low carbon steel plates were coated with different spraying methods and materials to obtain protective layers with improved erosion-corrosion resistance in geothermal turbine environment. The experiment will describe explore which of the tested spraying method and material is the most suitable for this application. This paper reports the first results from the tests and inspection of the coatings on the low carbon steel; including visual inspection microstructural and chemical composition analysis with SEM and XEDS.

Key words: coated carbon steel, geothermal environment, turbine, erosion-corrosion.

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