Passivity of AlCrFeMnTi and AlCrFeCoNi high–entropy alloys in Hanks’ solution
Source abstract
Abstract
The present work studies the passivation characteristic and corrosion resistance of Al 20Cr 5Fe 50Mn 20Ti 5 and Al 7Cr 23.26Fe 23.26Co 23.26Ni 23.26 high–entropy alloys in Hanks’ solution at 37 °C, in view of potential biomedical applications. The Al 7Cr 23.26Fe 23.26Co 23.26Ni 23.26 possesses a higher corrosion resistance than Ti-6Al-4 V alloy, mainly due to the formation of a stable p–type passive film composed of Cr(OH) 3, Cr 2O 3, CoO, Co 3O 4, and Ni(OH) 2, leading to low vacancy concentration and limited ion conductivity. The Al 20Cr 5Fe 50Mn 20Ti 5 exhibits an n–type passive film composed of Fe 2O 3, Fe(OH) 3, TiO 2, and MnO 2 that promotes chloride ions adsorption and diffusion–controlled corrosion, while its microstructural precipitates allowed a selective dissolution.
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Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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