腐蚀
钝化
合金
电解质
电化学
水溶液
线性扫描伏安法
材料科学
化学
化学工程
循环伏安法
化学稳定性
伏安法
无机化学
冶金
纳米技术
电极
有机化学
物理化学
工程类
图层(电子)
作者
Ulysse Rocabert,Falk Muench,Maximilian Fries,Benedikt Beckmann,Konrad Loewe,Hugo A. Vieyra,M. Katter,Kristina Navickaitė,Wolfgang Ensinger,Oliver Gutfleisch
标识
DOI:10.1016/j.electacta.2022.141200
摘要
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.
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