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Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site

Geothermal process equipment and accessories are usually manufactured from low-alloy steels which offer affordability but increase the susceptibility of the materials to corrosion. Applying erosion-corrosion-resistant coatings to these components could represent an economical solution to the problem...

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Autores principales: Thorhallsson, Andri Isak, Fanicchia, Francesco, Davison, Emily, Paul, Shiladitya, Davidsdottir, Svava, Olafsson, Dagur Ingi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8200011/
https://www.ncbi.nlm.nih.gov/pubmed/34199772
http://dx.doi.org/10.3390/ma14113071
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author Thorhallsson, Andri Isak
Fanicchia, Francesco
Davison, Emily
Paul, Shiladitya
Davidsdottir, Svava
Olafsson, Dagur Ingi
author_facet Thorhallsson, Andri Isak
Fanicchia, Francesco
Davison, Emily
Paul, Shiladitya
Davidsdottir, Svava
Olafsson, Dagur Ingi
author_sort Thorhallsson, Andri Isak
collection PubMed
description Geothermal process equipment and accessories are usually manufactured from low-alloy steels which offer affordability but increase the susceptibility of the materials to corrosion. Applying erosion-corrosion-resistant coatings to these components could represent an economical solution to the problem. In this work, testing of two newly developed laser metal deposited high-entropy alloy (LMD-HEA) coatings—CoCrFeNiMo(0.85) and Al(0.5)CoCrFeNi, applied to carbon and stainless steels—was carried out at the Hellisheidi geothermal power plant. Tests in three different geothermal environments were performed at the Hellisheidi site: wellhead test at 194 °C and 14 bar, erosion test at 198 °C and 15 bar, and aerated test at 90 °C and 1 bar. Post-test microstructural characterization was performed via Scanning Eletron Microscope (SEM), Back-Scattered Electrons analysis (BSE), Energy Dispersive X-ray Spectroscopy (EDS), optical microscopy, and optical profilometry while erosion assessment was carried out using an image and chemical analysis. Both the CoCrFeNiMo(0.85) and Al(0.5)CoCrFeNi coatings showed manufacturing defects (cracks) and were prone to corrosion damage. Results show that damage in the CoCrFeNiMo(0.85)-coated carbon steel can be induced by manufacturing defects in the coating. This was further confirmed by the excellent corrosion resistance performance of the CoCrFeNiMo(0.85) coating deposited onto stainless steel, where no manufacturing cracks were observed.
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spelling pubmed-82000112021-06-14 Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site Thorhallsson, Andri Isak Fanicchia, Francesco Davison, Emily Paul, Shiladitya Davidsdottir, Svava Olafsson, Dagur Ingi Materials (Basel) Article Geothermal process equipment and accessories are usually manufactured from low-alloy steels which offer affordability but increase the susceptibility of the materials to corrosion. Applying erosion-corrosion-resistant coatings to these components could represent an economical solution to the problem. In this work, testing of two newly developed laser metal deposited high-entropy alloy (LMD-HEA) coatings—CoCrFeNiMo(0.85) and Al(0.5)CoCrFeNi, applied to carbon and stainless steels—was carried out at the Hellisheidi geothermal power plant. Tests in three different geothermal environments were performed at the Hellisheidi site: wellhead test at 194 °C and 14 bar, erosion test at 198 °C and 15 bar, and aerated test at 90 °C and 1 bar. Post-test microstructural characterization was performed via Scanning Eletron Microscope (SEM), Back-Scattered Electrons analysis (BSE), Energy Dispersive X-ray Spectroscopy (EDS), optical microscopy, and optical profilometry while erosion assessment was carried out using an image and chemical analysis. Both the CoCrFeNiMo(0.85) and Al(0.5)CoCrFeNi coatings showed manufacturing defects (cracks) and were prone to corrosion damage. Results show that damage in the CoCrFeNiMo(0.85)-coated carbon steel can be induced by manufacturing defects in the coating. This was further confirmed by the excellent corrosion resistance performance of the CoCrFeNiMo(0.85) coating deposited onto stainless steel, where no manufacturing cracks were observed. MDPI 2021-06-04 /pmc/articles/PMC8200011/ /pubmed/34199772 http://dx.doi.org/10.3390/ma14113071 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Thorhallsson, Andri Isak
Fanicchia, Francesco
Davison, Emily
Paul, Shiladitya
Davidsdottir, Svava
Olafsson, Dagur Ingi
Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site
title Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site
title_full Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site
title_fullStr Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site
title_full_unstemmed Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site
title_short Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site
title_sort erosion and corrosion resistance performance of laser metal deposited high-entropy alloy coatings at hellisheidi geothermal site
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8200011/
https://www.ncbi.nlm.nih.gov/pubmed/34199772
http://dx.doi.org/10.3390/ma14113071
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