A multicomponent High Entropy Alloy (HEA) AlCrFeNiMn processed with vacuum arc remelting procedure was tested for corrosion in geothermal environment in the Reykjanes Geothermal Power Plant in Iceland. Microstructural and chemical composition analysis of the material was performed before and after testing in the geothermal steam with an electron scanning microscope (SEM) and X-ray Energy Dispersive Spectroscopy (X-EDS). A weight loss method was also used to measure the corrosion rate of the AlCrFeNiMn high entropy alloy. The results showed that the uniform corrosion rate was quite high, on average 3 mm/year. Microstructural and chemical composition analyses of the specimen after the exposure in the geothermal environment revealed corrosion products, containing sulfur and oxygen. The high corrosion rate suggests the AlCrFeNiMn would not be suitable for coating layer for geothermal component.

Subject
Test methods, Geothermal energy, Materials, Corrosion resistant alloys, Composition, Corrosion rate, Structures, Corrosion testing, Entropy, Oxygen, Elements, Steam, Alloys
Keywords:
corrosion, geothermal environment, multicomponent alloys, microstructure, corrosion products
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2017
Association for Materials Protection and Performance (AMPP)
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