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Electrochemical corrosion study of La(Fe11,6-xSix1,4Mnx)H1,5 in diverse chemical environments

Rocabert, Ulysse ; Muench, Falk ; Fries, Maximilian ; Beckmann, Benedikt ; Loewe, Konrad ; Vieyra, Hugo A. ; Katter, Matthias ; Barcza, Alexander ; Ensinger, Wolfgang ; Gutfleisch, Oliver (2022)
Electrochemical corrosion study of La(Fe11,6-xSix1,4Mnx)H1,5 in diverse chemical environments.
In: Electrochimica Acta, 434
doi: 10.1016/j.electacta.2022.141200
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

La-Fe-Si-based alloys represent a promising material class for magnetocaloric cooling at ambient temperatures, but contain highly oxophilic elements and are chemically sensitive, which impairs their continued operation in aqueous heat exchange media. The development of protection strategies ensuring long-term stability necessitates a comprehensive understanding of the material's corrosion characteristics. The present work focuses on a such an assessment for hydrogenated La(FeMnSi)13 containing α-Fe to enhance it's mechanical properties. Linear sweep voltammetry served as the main analytical tool and was performed in preferably buffered electrolytes with pH values reaching from moderately acidic to strongly alkaline, in the presence and absence of corrosion-enhancing species (chloride, chelators). α-Fe, La1Fe1Si1, and La(FeSi)13 were employed as reference materials to clarify the passivation pattern of the material in carbonate buffer. Specific chemical compounds with clear mechanistic impact (phosphate acting as precipitate former, hydrazine as oxygen scavenger) were tested alongside commercial corrosion inhibitors to investigate their effects. Our objective is to provide a systematic evaluation of the corrosion properties of the alloy system, building on previous investigations and taking into account its general materials chemistry.

Typ des Eintrags: Artikel
Erschienen: 2022
Autor(en): Rocabert, Ulysse ; Muench, Falk ; Fries, Maximilian ; Beckmann, Benedikt ; Loewe, Konrad ; Vieyra, Hugo A. ; Katter, Matthias ; Barcza, Alexander ; Ensinger, Wolfgang ; Gutfleisch, Oliver
Art des Eintrags: Bibliographie
Titel: Electrochemical corrosion study of La(Fe11,6-xSix1,4Mnx)H1,5 in diverse chemical environments
Sprache: Englisch
Publikationsjahr: 1 Dezember 2022
Verlag: Elsevier
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Electrochimica Acta
Jahrgang/Volume einer Zeitschrift: 434
DOI: 10.1016/j.electacta.2022.141200
Kurzbeschreibung (Abstract):

La-Fe-Si-based alloys represent a promising material class for magnetocaloric cooling at ambient temperatures, but contain highly oxophilic elements and are chemically sensitive, which impairs their continued operation in aqueous heat exchange media. The development of protection strategies ensuring long-term stability necessitates a comprehensive understanding of the material's corrosion characteristics. The present work focuses on a such an assessment for hydrogenated La(FeMnSi)13 containing α-Fe to enhance it's mechanical properties. Linear sweep voltammetry served as the main analytical tool and was performed in preferably buffered electrolytes with pH values reaching from moderately acidic to strongly alkaline, in the presence and absence of corrosion-enhancing species (chloride, chelators). α-Fe, La1Fe1Si1, and La(FeSi)13 were employed as reference materials to clarify the passivation pattern of the material in carbonate buffer. Specific chemical compounds with clear mechanistic impact (phosphate acting as precipitate former, hydrazine as oxygen scavenger) were tested alongside commercial corrosion inhibitors to investigate their effects. Our objective is to provide a systematic evaluation of the corrosion properties of the alloy system, building on previous investigations and taking into account its general materials chemistry.

Freie Schlagworte: LaFeSi alloys, Magnetocalorics, Corrosion, Intermetallics, Linear sweep voltanometry
Zusätzliche Informationen:

Artikel-ID: 141200

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien
Hinterlegungsdatum: 15 Mär 2023 06:01
Letzte Änderung: 15 Mär 2023 06:01
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