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Microstructural Study of the Corrosion Effect on AlCrFeNiMn Multicomponent Alloy Tested in Geothermal Environment

Picture for Microstructural Study of the Corrosion Effect on AlCrFeNiMn Multicomponent Alloy Tested in Geotherma
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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.

Product Number: 51317--8916-SG
ISBN: 8916 2017 CP
Author: Ioana Csaki
Publication Date: 2017
Industry: Energy Generation
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$20.00
$20.00

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.

Key words: corrosion, geothermal environment, multicomponent alloys, microstructure, corrosion products

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.

Key words: corrosion, geothermal environment, multicomponent alloys, microstructure, corrosion products

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